Learning lessons from operational research in infectious diseases: can the same model be used for noncommunicable diseases in developing countries?
Authors Bosu W
Received 16 September 2014
Accepted for publication 8 October 2014
Published 4 December 2014 Volume 2014:5 Pages 469—482
Checked for plagiarism Yes
Review by Single anonymous peer review
Peer reviewer comments 2
Editor who approved publication: Dr Md Anwarul Azim Majumder
William K Bosu
Department of Epidemics and Disease Control, West African Health Organisation, Bobo-Dioulasso, Burkina Faso
Abstract: About three-quarters of global deaths from noncommunicable diseases (NCDs) occur in developing countries. Nearly a third of these deaths occur before the age of 60 years. These deaths are projected to increase, fueled by such factors as urbanization, nutrition transition, lifestyle changes, and aging. Despite this burden, there is a paucity of research on NCDs, due to the higher priority given to infectious disease research. Less than 10% of research on cardiovascular diseases comes from developing countries. This paper assesses what lessons from operational research on infectious diseases could be applied to NCDs. The lessons are drawn from the priority setting for research, integration of research into programs and routine service delivery, the use of routine data, rapid-assessment survey methods, modeling, chemoprophylaxis, and the translational process of findings into policy and practice. With the lines between infectious diseases and NCDs becoming blurred, it is justifiable to integrate the programs for the two disease groups wherever possible, eg, screening for diabetes in tuberculosis. Applying these lessons will require increased political will, research capacity, ownership, use of local expertise, and research funding.
Keywords: infectious diseases, noncommunicable diseases, operational research, developing countries, integration
According to the Global Burden of Disease Study, the proportion of all deaths attributable to noncommunicable diseases (NCDs) in developing countries increased from 47.5% in 1990 to 58.3% in 2010.1 Similarly, the proportion of all disability-adjusted life-years (DALYs) lost attributable to NCDs increased from 36.4% to 48.6% over the same period. The burden varies between and within regions of the developing world. In the Eastern Caribbean region, 70% of years of life lost are due to NCDs.2 In Brazil, 72% of all deaths were attributable to NCDs in 2007.3
Developing countries face peculiar challenges relating to the epidemiology and control of NCDs. Cardiovascular disease (CVD)-related deaths occur 20 years earlier than in developed countries.4 They have a larger share of cancers of infectious disease etiology than developed countries (22.9% versus 7.4%).5 Chagas disease as a cause of cardiomyopathy occurs predominantly in Latin America. The huge burden of NCDs of infectious origin is blurring the traditional division of diseases into communicable diseases and NCDs, and has to led to calls for integration of interventions.6,7 The relationship between tuberculosis (TB) and diabetes and its comorbidity with other NCDs has been well documented.8,9 The increasing use of highly active antiretroviral treatment (HAART) may be associated with an increased risk of CVDs.10
Unlike developed economies, there is low awareness of the risk factors for NCDs, even among health workers in developing countries. There is consequently late reporting when diseases have advanced, recourse to plant and homeopathic medicines, and generally poor outcomes. Up to 80% of hypertension or diabetes may be undiagnosed.11–13 Target-organ damage resulting from long-standing hypertension is relatively common.14 Cancers are typically diagnosed at their advanced stages.15
The financial burden on the fragile health systems of developing countries is enormous. Owing to their chronic course, incurability, and general high cost of treatment, NCDs are able to tip households into poverty or to maintain them in poverty. The impact on households is worst on vulnerable households in whom 30%–50% of their household incomes may be spent on chronic illnesses.16 In India, households containing a member with CVD spent 2.5 times as much of their total out-of-pocket expenditure on health care as that of socioeconomically and demographically matched control households (27.2% versus 10.7%, P<0.01).17
The health systems of developing countries are oriented toward acute illnesses and not chronic illnesses.18 Many countries do not have NCD policies that sufficiently address the major risk factors.19 With continuing globalization, urbanization, aging, and nutrition transition, NCDs are projected to increase in developing countries in the coming decades.20 There is now a rapid growth of food and beverage industries, aggressive advertising, and weak regulation, all of which have contributed to the consumption of sugar-sweetened beverages from an early age.21 The consumption of dietary salt exceeds the World Health Organization (WHO)-recommended levels in many developing countries.22 Tobacco and alcohol products are also increasingly being marketed in developing countries.23
In response to the growing threat from NCDs, there have been several regional and international initiatives. The most notable recent initiative was the United Nations (UN) General Assembly Political Declaration on the Prevention and Control of NCDs in September 2011. The high-level UN meeting has served to raise the profile of NCDs as a developmental issue, as they undermine the attainment of the Millennium Development Goals by 2015.24 There are continuing discussions on country actions and reforms needed to meet the UN commitments on NCDs.25,26
The political declaration calls for investments in research and development related to improving the prevention and control of NCDs.24 Priority areas include improving program performance, health promotion, surveillance, cost-effectiveness, and sustainable interventions, as well as sharing of best practices and lessons learned. The WHO Global Plan Action 2013–2020 also specifies the promotion and development of national capacity for research as one of its six principal objectives.27 The World Health Report 2013, with its theme “Research for universal health coverage”, argues for evidence-based actions to ensure affordable and quality health services that are accessible to all of a country’s population.28
Despite the growing burden of NCDs in developing countries and the importance of research in defining and monitoring their control, research output has been low. In line with the UN political declaration, this paper describes the research output on NCDs from developing countries and the impact of infectious disease in these countries, and examines some experiences from operational research on infectious diseases that could be applied to NCDs. It focuses on the four major NCDs covered by the declaration: CVDs, cancers, chronic respiratory diseases, and diabetes.
Research output on NCDs in developing countries
The volume of research in developing countries on NCDs is very low, likely a reflection of the huge research-funding gap between developed and developing countries. Of 86,711 articles on CVD research published between 1995 and 2002 globally and available from the PubMed database, 90.5% were from Western Europe, the US, Japan, and Canada.29 Latin America and the Caribbean accounted for 1.1% of the articles, while Africa accounted for a lowly 0.3%. Mendis et al observed that 78%–79% of CVD publications in 1991, 1996, and 2001 came from developed market economies, 6%–8% from developing countries, and 4%–8% from developing Eastern European countries.30 It is striking that there were no publications on CVDs from 82 developing countries in any of those years. More recently, of the 3%–4% of CVD papers that focused on at least one of the 20 WHO NCD priority-research areas, 23% came from low- and middle-income countries.31 The share of papers in the WHO priority areas from low-income countries increased from 0% to 2% from 2002 to 2011, while that from middle-income countries increased from 10% to 21% over the same period.
A major reason for the low research output on NCDs from developing countries is low funding. Research output correlates well with gross domestic product per capita and with health expenditure per capita.29,32,33 Between 2004 and 2007, the proportion of the overall development assistance for health allocated to NCDs increased from 1.5% to 2.3%, while that for human immunodeficiency virus (HIV), TB, and malaria increased from 20.1% to 28.7%.34 Donor funding amounted to only US¢78 for each DALY due to NCDs in 2008 compared with $23.9 each DALY due to HIV, TB, and malaria. Without adequate funding, it is not surprising that publications on NCD research in developing countries are limited.33 Other reasons for low research output, such as low research capacity and limited training opportunities, are discussed later.
Impact of infectious disease research on health
The impact of health research and development on the control of infectious diseases has been enormous. It has provided the tools for the production of medicines, vaccines, and technology that have contributed improved survival of humanity. After the eradication of smallpox, the world is now on the brink of eradicating poliomyelitis and guinea-worm disease. Preventive chemotherapy neglected tropical diseases (NTDs), including onchocerciasis, lymphatic filariasis, and trachoma, and other NTDs, such as leprosy, have been targeted for elimination. Much progress has also been achieved with other poverty-associated NTDs, such as yaws and Buruli ulcer. Tremendous progress has also been made with the prevention and control of immunizable diseases, such as measles, diphtheria, whooping cough, and tetanus. Progress with the elimination of measles continues: its ranking as a cause of death in developing countries dropped from 16th to 53rd between 1990 and 2010.1 Conjugate vaccines have been developed that have now permitted vaccines against meningitis and pneumonia to be included in childhood immunization schedules.
Besides vaccines, improved drug treatment has contributed to the prevention and control of three of the major causes of disease burden in developing countries: malaria, TB, and HIV.35 Buoyed by the success of HAART, the Joint United Nations Programme on HIV/Acquired Immunodeficiency Syndrome (AIDS) has launched a campaign of zero new infections and zero AIDS-related deaths by 2015.36 The impact of these achievements transcends the spread of disease to other persons. It has benefits for NCDs and improved maternal and child health and nutrition, as well as socioeconomic benefits.
It is noteworthy that the impact of health research on infectious diseases is not merely attributable to the drugs or vaccines. It is through operational research that the effectiveness of the products under real-world settings are evaluated and their acceptability and best methods of delivery determined. Zachariah et al define operational research in terms of “knowledge on interventions, strategies, or tools that can enhance the quality, effectiveness, or coverage of programmes”.37 Operational research has helped to influence practice and policy for several infectious diseases. Examples include the SAFE (Surgery [for trichiasis]–Antibiotics–Facial cleanliness–Environmental improvement) strategy for trachoma,38 expanding coverage of HAART,39–41 evaluating pre-HAART,42 evaluating surveillance for malaria elimination,43 improving the management of HIV–TB coinfection,44 evaluating cotrimoxazole preventive therapy,45 improving the diagnosis and management of recurrent TB,46 preventing mother-to-child transmission of HIV,47 and the preventive treatment of malaria in infants.48 In their paper on the concepts, contributions, and challenges on operational research, Zachariah et al provide 16 examples of how it has improved medical care and practice, been used to assess the feasibility of interventions, and been used to advocate policy change.37
The application of operational research to derive the most impact from infectious diseases has not been fortuitous, but has been systematic. In the example of malaria control, a number of randomized controlled trials were conducted in Africa in the mid-1990s to establish the efficacy of insecticide-treated nets (ITNs) and materials for preventing malaria in children and pregnant women.49–53 A Cochrane systematic review concluded that ITNs reduced malaria-related mortality by 17% and morbidity by 34% when compared with untreated nets.54 The impact of ITNs was then tested in effectiveness studies in which the settings were less controlled and the ITNs had to be purchased. Further studies assessed whether the protective effects of ITNs were sustained in the long term.55 The cost-effectiveness of ITNs compared with other malaria-control interventions was also assessed.56–59 Operational research also examined operational issues in the delivery of the ITNs60 and factors influencing acceptability and use of the ITNs.61–63
Within a few years of the initial trial results, ITNs were introduced into malaria-control programs throughout Africa.64 Delivery mechanisms evolved to include mass distribution, sometimes as part of supplementary immunization campaigns.65 Operational research was conducted to answer implementation issues on both the demand and supply sides.66,67 Free ITNs given to pregnant women during antenatal care in Kinshasa resulted in increased usage from 25% at baseline to 80% at 6 months postdelivery.68 In Tanzania, the implementation of a national voucher program for ITNs led to increased ownership and use of the ITNs. Questions on the availability and use of ITNs were incorporated into demographic and health surveys.69 Local production of ITNs was established to assure sustainability.70 More recently, continued monitoring has led to a suspicion that the introduction of ITNs has been associated with insecticide resistance of the parasite and a waning of the immunity of children against malaria.71
A similar systematic approach could be described for the prevention of mother-to-child transmission of HIV, scaling up of antiretroviral therapy, directly observed therapy of TB, or the intermittent preventive treatment of malaria.
Cross-cutting challenges on operational research in developing countries
The capacity for health research in developing countries is weak across all the major disease groups: infectious diseases, communicable diseases, and injuries.72 A recent review identified such barriers as poorly equipped facilities, weak referral and follow-up systems, limited geographical access to services, limited knowledge and skills of health workers, weak health information systems, poor availability of drugs, and high service charges as hindering the management and delivery of NCD services in the Asia-Pacific region.18
Ethical review processes in developing countries often do not meet international standards. For instance, only 38% of 64 research-ethics committees in developing countries had their own annual budget.73 The committees who received an annual budget were significantly more likely to have a policy to check on conflicts of interest among their members and to organize continuing education.
Besides capacity, another overarching critical factor for operational research on all disease types is an enabling legislative or policy framework. A recent review of health research systems in 44 countries of the WHO African region found that only 30% had a national health research policy and 20% had a strategic plan.74 The research policy will usually address such issues as situation analysis, strategic vision for health research, guiding principles, priority setting, structural arrangements and relationships, capacity building, production, dissemination and utilization, ethical review, intellectual property, resource mobilization, and monitoring and evaluation. It should be aligned with overall health policy and respond to the prevailing health problems in the country. It should be dynamic and respond to new trends in research, including genetics and stem cell research. There is need for a lead health research institution and a national coordinating mechanism to plan, coordinate, and monitor the overall implementation of research activities. The governance structure is crucial to the planning of periodic national forums for priority setting and dissemination of research findings. Of the countries of the WHO African region, only a fifth have functional national health research management forums.74
Potential lessons to be learned from operational infectious disease research
Against the background of the challenges of conducting and managing research, there are some important lessons that could potentially be learned from the experiences from operational research on infectious diseases. Developing countries have had a longer and deeper experience with infectious diseases. These lessons relate to priority setting, survey methods, data sources, measurements, funding, and management. While the lessons are drawn from infectious diseases, several of the approaches are common to both disease groups and are not necessarily linear.
There are guidelines on the process and the value of priority setting for health research in developing countries.75 A very useful checklist on the process for setting health research priorities is also available.76 It outlines what activities and factors should be considered in the preparatory stage, how priorities could be decided on, and what actions follow after priorities have been set. Priorities should be guided by the public health benefit and the cost and feasibility of implementation. They could be identified using consensus-based approaches and/or metric-based approaches. In Nigeria, a wide consultation involving policy makers and stakeholders at the state level was adopted to develop health research priorities using the essential national health research framework of the Council on Health Research for Development (COHRED).77 In East Timor, health research priorities were determined through an analysis of published and unpublished studies between 2001 and 2011.78
The Child Health and Nutrition Research Initiative is an example of a metric-based approach that is increasingly being used in the developing country context.79 It uses a scientific, systematic, and transparent scoring system to assess various research options in terms of their potential answerability, potential to produce effective health interventions, potential for the intervention to be affordable and sustainable, and potential for the study to reduce disease burden and inequities.
Whatever the process, it is important to have a clearly articulated set of research priorities. Operational research priorities have been defined for such infectious diseases as guinea-worm disease,80 helminthiasis,81 NTDs,82 TB,83,84 malaria,85 and HIV control.86 The research priorities for NCDs should define the scope of what diseases a country considers NCDs. In developing countries, the focus on the four major NCDs (CVDs, diabetes, cancers, and chronic respiratory infections) and the four major risk factors (diet, physical activity, tobacco, alcohol) will enable their research programs to be better aligned to the WHO Global Action Plan 2013–2020 and the global target of 25% reduction in premature NCD mortality by 2025.87
The WHO has published a priority-research agenda on CVDs with a focus on developing countries after a series of consultations between 2008 and 2010.88 The objectives of the agenda are to promote evidence-led decisions and actions to tackle NCDs, identify the knowledge gaps for which research is needed, and to strengthen NCD research capacity in developing countries. The agenda includes studies on the burden and social costs of CVD and other NCDs, social determinants of behavioral influences on NCDs, approaches to early detection, economic evaluation of models of combination of intervention, feasible and cost-effective methods of delivery of interventions for primary and secondary prevention of CVD, fixed-dose combination preventive and curative therapy, and the development and deployment of safer and affordable vaccines and drugs, particularly those against rheumatic heart disease and Chagas disease.
In November 2011, the Consortium for NCD Prevention and Control in Sub-Saharan Africa, with the support of the International Development Research Centre (IDRC), held a consultative meeting to develop a priority NCD research and capacity-building agenda in Africa.89 The priority-research issues were similar to those developed by the WHO. The agenda included epidemiological studies on the magnitude, patterns, and trends of disease, analysis of the determinants and social inequities, delivery of interventions, and the evaluation of their impact. It also specified studies to draw lessons from communicable diseases that could be applied to NCDs.
Besides the global and regional efforts, individual countries have identified research priorities for NCDs, the specific diseases, or their risk factors.90 For example, India has assessed its priorities on cancer research.91 As these priorities are defined more closely to the service-delivery or program-implementation level, they are more likely to reflect local needs.
The important lesson here is that a set of research priorities for NCDs should be defined within the framework of a national health research policy or plan. This process should be transparent, and consultations should be wide and include program managers and researchers on communicable diseases. In the light of the biological and epidemiological link between diabetes and TB,92 questions have been asked about the value of routinely screening TB patients for diabetes.93 Questions have also been asked about how the application of the widely successful DOTS (directly observed therapy, short course) could be of benefit to chronic NCDs.94 In Brazil, analysis of nationwide data showed that HIV-infected persons were significantly more likely to die from NCDs than non-HIV-infected persons.95 These reports of association between infectious diseases and NCDs illustrate the importance of involving stakeholders from both disease groups in order to develop NCD research priorities.
Integration of operational research into programs
The National TB Program (NTP) of Malawi is a remarkable example of how the integration of operational research into programs between 1996 and 2005 led to the prolific production of publications.96 The facilitating factors were the use of TB registers that captured clinical data including outcomes for cohorts of patients, regular clinical audit of these patients, monitoring of TB–HIV coinfections, and the appointment of a full-time operational research officer and a data manager.97 Problems and knowledge gaps identified during the implementation of the program activities were evaluated for research. This meant that the findings had direct and quicker application to the improvement of program performance and clinical practice.
The analysis of data obtained from routine reporting forms and registers to answer program-related questions and the subsequent publication of findings in peer-reviewed journals was thought to have inspired the health workers.97 This approach does not mean that research produced by academic and research institutions is not relevant. On the contrary, in order to improve its value in influencing practice or policy, it is essential that at the national or local level, a win–win partnership should be formed to conduct the operational research. The academic institutions will tend to have the research know-how, whereas it is the health workers who are responsible for service delivery and collecting routine data from which research questions could emerge. The NTP of Malawi organized annual scientific meetings during which research findings were presented and discussed.
Motivated by the desire to evaluate interventions in real-life settings, academics have integrated a cluster-randomized trial comparing strategies for HIV care into routine health care delivery in Uganda.98 Access to adequate funding and the availability of research capacity are crucial prerequisites to integrating operational research into programs. The NTP has the unique advantage of being vertically run with its own set of data-collection forms, registers, and laboratory forms and reporting primarily to the NTP rather than to the National Health Records Office. Further, the NTP has very good control of anti-TB drugs, as these drugs are used almost exclusively for TB and are provided free of charge. In contrast, the drugs for NCDs are not controlled by the NCD Control Program. While there could be disease-specific registers, such as those for diabetes or hypertension, these are usually managed at the hospital level and reports sent to the National Health Records Office.
Despite these limitations, NCD programs can still learn some lessons from infectious disease-control programs. For example, disease registers could be designed to collect information on family history, behavioral risk factors such as smoking, and practice of self-monitoring of glycemia. NCD control programs in developing countries therefore could pay more attention and integrate operational research into service delivery and program management.
Use of routine data
Routine data have been used for operational research to evaluate HIV testing and treatment among TB patients and to scale up anti-retroviral therapy (ART).99 Routine data have the advantages of being relatively easy to collect, cheaper, and easily adaptable. They have often been commonly used in the hospital settings to report case series, treatment outcomes, and cost studies. The main disadvantage is that when applied to patients in hospital settings, they may not be representative of the population from which the cases are drawn. Further, health workers are often overburdened, and so there are a limited number of variables on which data can be routinely collected on.
Cancer-registration systems use routine data collected in a systematic manner, usually in centers that have histopathologists or radio-oncology services. Routine data have been used to estimate the prevalence of hypertension in workers or other defined population groups,100 or to assess outcomes in a cohort of diabetic patients in primary health care settings after a 3-year follow-up.101
The choice of study designs in operational research depends on the study objective. These methods include descriptive and analytical studies, experimental design, and mathematical modeling.102 Owing to the limitations of routine data, such surveys as WHO STEPS, the Global Youth Tobacco Survey, and Global school-based health surveys are frequently used to estimate the prevalence of NCDs and monitor the major risk factors.
Rapid survey methods and analytical tools
Rapid tools for estimating the prevalence of infectious diseases are readily available for a number of infectious diseases. Rapid epidemiological mapping of onchocerciasis for mapping the prevalence and distribution has been widely used in the onchocerciasis-elimination program over the past 20 years.103,104 Onchocerciasis is identified through simple palpation in adult males for nodules. Rapid methods have been or are also being developed for the assessment of schistosomiasis, trachoma, and other preventive chemotherapy NTDs.105 Rapid-assessment procedures for loiasis, a rapid-assessment tool for the mapping of loiasis, has been used in combination with rapid assessment of onchocerciasis.106 Outside of NTDs, another rapid-assessment tool is the Expanded Program of Immunization cluster survey, which was developed to estimate the coverage of immunization through the sampling of seven children aged 12–23 months in each of 30 clusters.107
Rapid-assessment tools depend on a reduced geographical area, a specified age-group, or the use of rapid diagnostic methods to rapidly assess the occurrence of disease or a condition and its distribution. The samples used in a rapid assessment may not be probability samples, but are designed to yield reliable information of programmatic value when conducted in a systematic way over time. The rapid surveys often combine interviews and examination of persons. For NCDs, rapid-assessment tools are generally lacking. One available tool is Rapid Assessment of Avoidable Blindness, used to assess the prevalence and causes of blindness and visual impairment.108
Besides the need for rapid epidemiological methods, operational research on NCDs could also benefit from rapid data collection and analysis. One example of such a tool is the electronically based STEPS survey or eSTEPS developed by the WHO, used for risk-factor survey of NCDs.109 It involves the use of personal digital assistants with a suite of software for data collection, data-quality checks, and tools for data analysis. The use of eSTEPS not only enables rapid data collection and analysis or the transport of fewer materials but also allows higher-quality data and standardization across studies in different sites.
Rapid diagnostic methods
Rapid tests are being continually developed for the diagnosis of malaria, TB, and HIV. The use of noninvasive samples, such as saliva and urine, has made a tremendous impact on home-based testing and on integrated biobehavioral surveillance of HIV in the general population and high-risk groups.110,111 One has to struggle to find similar high-impact rapid diagnostic tests for NCDs. One such test is the visual inspection of the cervix after application of acetic acid (VIA) or Lugol’s iodine. The color change in the squamocolumnar epithelial junction of the cervix correlates with precursor changes that could lead to cervical cancer. VIA requires relatively inexpensive equipment, and can be performed by nonphysicians. These attributes have made it an attractive option for cervical cancer screening in developing countries.112 There are very promising prospects for the more superior simple rapid tests based on human papilloma virus (HPV) deoxyribonucleic acid tests, as these have already been used in rural areas in developing countries.113 The use of self-sampling is an added advantage for improving access to cervical cancer screening.114
Home-based test kits are available for the diagnosis of HIV. With regard to NCDs, home-based electronic devices are available for measuring blood levels of glucose, cholesterol, and triglycerides. Urine test strips can be used to diagnose urinary tract infections and biochemical abnormalities (ketones, protein, sugar). There are also electronic monitors for monitoring blood pressure. Patient self-monitoring is an essential part of the management of hypertension and diabetes. It is the availability of these home-based tests that makes it easier to assess risk factors or NCDs during field surveys. The disadvantage of these electronic devices is their high cost, which precludes their wide use in developing countries. The device for home blood-pressure monitoring, for example, costs $80–$100. However, it is believed that home blood-pressure monitoring could be potentially cost-saving in the long term, due to its advantages in detecting white-coat hypertension, improving treatment compliance, and reducing medication.115,116
Algorithms are widely used in the diagnosis and management of several infectious diseases, such as malaria, sexually transmitted infections, TB, and HIV. One advantage of the use of algorithms is that they can be tailored to a variety of health care-delivery settings. For example, the actions to be taken in the management of sexually transmitted infection syndromes depend on the availability of laboratory services. With respect to NCDs, at least 19 algorithms have been developed for the diagnosis and management of various conditions in the WHO Package of Essential Noncommunicable Disease Interventions for Primary Health Care in Low-Resource Settings.117
The principle of chemoprophylaxis for primary or secondary prevention of infectious diseases is well known. It aims to prevent infection or disease when a person comes into contact with the infectious disease agent. Immunoglobulins are given when a person is suspected to have been exposed to the tetanus toxin or to the rabies virus. Postexposure prophylaxis with antiretroviral drugs is given to persons exposed to HIV through injury or sex. Penicillin V prophylaxis is a long-standing method of protecting patients with sickle-cell anemia from pneumococcal infection or those with rheumatic heart disease from disease when undergoing intestinal surgery or dental procedures. Cotrimoxazole preventive prophylaxis therapy provided to persons with symptomatic HIV and intermittent preventive therapy for malaria in pregnancy and infants are other examples of chemoprophylaxis.118
The use of chemoprophylaxis in NCDs is less common. Examples include prophylactic HPV vaccination, prophylactic mastectomy,119 and chemoprophylaxis in high-risk persons to prevent breast cancer.120 Statins and fixed-dose combination therapy have been evaluated for the primary prevention of CVDs.121–123 Several drugs have been shown to prevent or delay the occurrence of diabetes in high-risk persons.124 Drugs such as statins and aspirin have been more commonly used for the secondary prevention of complications in those who already have CVD.
Operational research is needed in developing countries on chemoprophylaxis against NCDs. Although the effect of aspirin and statins in secondary prevention has long been known, they are underused in developing countries.125 For example, only 39% of eligible diabetic patients126 and 63% of hypertensive patients127 attending specialist clinics in Nigeria were on aspirin preventive treatment. Total cardiovascular risk assessment through the use of prediction charts rather than the management of single risk factors in resource-constrained settings could reduce unnecessary treatment and save drug costs by more than 50%.128 Operational research showed that only two of the three available cardiovascular risk-assessment scoring systems was appropriate for Malaysia.129 Based on the experiences of primary and secondary prevention of infectious diseases, there is a wide scope of operational research to improve both pharmacologic and nonpharmacologic prevention of NCDs.
The intensity of global attention to HIV/AIDS is reflected in the speed with which such models as the AIDS Impact Model and Spectrum were developed to help estimate the prevalence of HIV in the general population based on surveillance of pregnant women attending prenatal clinics. These models have been used to predict the demographic impact of AIDS, or to estimate the number of persons needing treatment.130–132 The models are continually refined, and so Spectrum 2013 has been developed.133 Modeling techniques have also been used to estimate the number of new infections of HIV according to modes of transmission that occur in individual countries.134 In the onchocerciasis-control program, the ONCHOSIM model is used to explore transmission and to provide crucial information on the number of years it will take to achieve elimination.135 These examples on these two infectious diseases illustrate how modeling could provide pertinent program information.
The most popular examples of modeling in NCDs are probably the cardiovascular risk-prediction score and cancer incidence and survival models.136,137 Models have also been used to predict out-of-office blood pressure from clinic measurements,138 guide the choice of HPV vaccines,139 assess the effectiveness of population-wide and individual high-risk strategies to prevent diabetes,140 and to predict the occurrence and progression of chronic kidney disease.141 These models have generally been used in high-income settings. Developing countries would benefit from models that have ready application in clinical practice (such as the Framingham risk score) and program and policy decision making in NCD prevention and control. For example, at the national level, NCD-control program managers in developing countries might be interested in the impact of urbanization and the nutrition transition on obesity and cardiometabolic diseases. They might also be interested in the impact of low detection, treatment, and control rates of hypertension on cardiovascular health. Modeling could also help address some of the persistent controversies regarding cancer screening142 or diabetes care.143 The absence of data from developing countries to feed mathematical models is a common challenge.
Process of translation from research to policy and practice
As previously described for ITNs, the translation of randomized control trial findings to policy is a systematic and phased process. This is also the case with the introduction of new vaccines into the immunization schedule of countries. This approach is not exclusively used by infectious disease programs. A team of American and Ghanaian obstetricians conducted a study to assess the safety and acceptability of cervical cancer screening through VIA and cryotherapy at a single-visit approach at a regional hospital in Accra.144 On the provider side, the quality of the diagnostics of the service providers (senior midwives and public health nurses) were compared with that of their trainers.145 The findings from these studies were satisfactory and informed the establishment of other VIA centers, including one in a rural site about 30 km from Accra.
Similarly, the Program for Appropriate Technology in Health and its local partners conducted formative research in Uganda, Peru, Vietnam, and India between 2006 and 2010 on the health policy environment that would inform the introduction of HPV vaccine in schoolgirls.146 Subsequently, the team conducted studies on the delivery mechanisms and factors that would help achieve high coverage of all three doses of the HPV vaccine.147
The main lessons from these examples are the values of formative research, understanding local circumstances, cost, affordability, and equity, and a gradual scaling up in the introduction of new tools, products, policies, and practices in NCDs. The phased approach allows the customized design of effective programs to address pertinent NCDs. There is also the need for continuing surveillance and postmarket evaluation after the introduction of the policy or intervention.
Facilitating factors and opportunities
Ensuring successful implementation of lessons learned from infectious disease research for the benefit of NCD research requires good political will, increased capacity, ownership, integrated planning, and funding. There is some evidence of increased political support for research. In 2006, the governments of Ghana and Nigeria, with support from the WHO Special Programme for Research and Training in Tropical Diseases, organized a high-level ministerial meeting on strategies for maximizing the benefits of health research for public health and development in Africa.148 The then president of Ghana, John Kufuor, delivered the keynote address at this meeting. Political support is needed to keep health research high on the agenda on priority actions for national development. The UN Political Declaration on NCDs provides the framework for addressing the major NCDs. The cross-cutting principles of health system strengthening and whole-of-government response are necessary for the conduct of any research and utilization of its findings. In other words, the political and social environment should be created for health research.
McKee et al divide countries into four groups on the basis of political commitment and research capacity: high commitment/low research, high commitment/moderate research, low commitment/low research, and low commitment/moderate research.149 They suggest that countries with high commitment and moderate research capacity could be supported to assist other countries in their region. Developing countries could benefit from training from international institutions and partnerships, such as the European and Developing Countries Clinical Trials Partnership, the Fogarty International Center’s International Research Ethics Education and Curriculum Development, and the African Cancer Registry Network.
While north–south collaboration is necessary, governments, regional economic communities, and partners should encourage the development of local and regional capacity. In this regard, such local initiatives as the Initiative to Strengthen Health Research Capacity in Africa, developed by health researchers and research funders in 2007, are commendable.150 Another regional initiative involves the strengthening of the health research systems of four countries (Guinea-Bissau, Liberia, Mali, and Sierra Leone) under a COHRED–West African Health Organization (WAHO) partnership with funding from the IDRC. It involves “strengthening governance structures, improving capacities of research institutions and researchers, financing research for health and enhancing the dissemination and utilisation of research results”.151 In order to facilitate networking on research among the Economic Community of West Africa member states, the West African Health Organization has established a web-based platform (West Africa HRWeb), which provides pertinent health systems research information, including governance, research policy, research priorities, key research groups, ongoing research projects, and financing.152 The West Africa Health Research Network has also instituted a 9-month internship to develop the research capacity of young scientists in the region. Ministries of health and funding agencies should recognize and utilize local and regional capacity in the training for and conduct of NCD research.153
The integration of NCD and infectious disease services presents a good opportunity for operational research of mutual benefit to be conducted. Examples of such services include the integration of cervical screening in HIV services, integrating smoking cessation in HIV care, screening persons on ART for CVDs and diabetes, integrating HIV and alcohol care, bidirectional screening of TB and diabetes, and leveraging HIV-testing campaigns for NCDs.93,154 Mass drug administration contributes to increased uptake of ITNs.155 Integration of services allows the efficient use of available resources for operational research on multiple diseases. Jaffar et al propose the scaling up of testing services for NCDs using the model of HIV service delivery.98 Besides integration, the lessons learned from the effective implementation of infectious diseases could be applied to NCDs. In Malawi, the successes of the NTP were applied to the management of persons attending a diabetic clinic.94 These included quarterly analysis of the cohort of registered diabetic patients, the delivery of health passports including the clinic record to be kept by patients, and the monitoring of defaulting patients.
Ensuring the successful application of lessons learned requires accurate records. The shift toward electronic records at the point of care in many developing countries will help to eliminate the tedious manual recording and analysis that already-overburdened health workers have to endure. Health research programs should take advantage of e-health and mobile health facilities to improve coverage, data quality, and monitoring.156 It is also essential to engage all stakeholders from the outset in priority-setting meetings, integration of operational research into programs, or dissemination meetings.97 Operational research has traditionally been regarded as inferior research, although that perception is changing with the publication of many research findings in high-impact peer-reviewed journals. This is of course attractive to donors for continued funding. The dilemma faced by researchers from developing countries is that the full-text papers in these high-impact journals are often not accessible to national or regional researchers, for whom the results would be particularly beneficial.
The lack of funding, particularly for NCD programs, has been a major limitation to the production of research papers on NCDs. Unlike infectious diseases that obtain some research funding from global institutions, such as the Global Fund to Fight AIDS, TB, and Malaria, the Special Programme for Research and Training in Tropical Diseases, the United States President’s Emergency Fund for AIDS Relief, and the President’s Malaria Initiative, NCDs do not generally enjoy such funding. NCDs therefore have to depend on global, multilateral, and bilateral institutions, such as the Wellcome Trust, World Diabetes Foundation, and IDRC for funding. There are calls for Western countries to provide financial support for operational research in developing countries.157 Developing countries should engage their governments and the private sector for support. In 2008, African ministers of health committed themselves to the COHRED recommendation that developing countries should allocate at least 2% of their national health expenditure and at least 5% of external aid for health projects and programs to health research.158 Partnerships and groups, such as the Programme for Action on Cancer Therapy, the Lancet NCD Action Group, and the Global Task Force on Expanded Access to Cancer Care and Control in Developing Countries, provide rich resources on NCDs that will be useful for operational research.
There is a paucity of research from developing countries in general and on NCDs in particular. Factors accounting for this include limited funding, higher priority being given to infectious diseases, and limited research capacity. It is therefore reasonable to explore what and how lessons from experiences in operational research on infectious diseases could be applied to NCDs. These lessons derive from setting research priorities, integration of research into NCD programs, use of routine data, use of rapid-assessment methods and modeling techniques, interventions such as chemoprophylaxis, and translational research processes. Successful implementation of lessons learned will require political will, increased funding, and clear plans.
I thank the editor for giving me the opportunity to present this paper. I would also like to thank Dr Jude Aidam for his comments on an early draft.
The author reports no conflicts of interest in this work.
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