Lymphogranuloma venereum: diagnostic and treatment challenges
Authors Ceovic R, Jerkovic Gulin S
Received 22 January 2015
Accepted for publication 17 February 2015
Published 27 March 2015 Volume 2015:8 Pages 39—47
Checked for plagiarism Yes
Review by Single-blind
Peer reviewer comments 3
Editor who approved publication: Professor Suresh Antony
Romana Ceovic,1 Sandra Jerkovic Gulin2
1Department of Dermatology and Venereology, University Hospital Center Zagreb and School of Medicine, Zagreb, Croatia; 2Department of Dermatology and Venereology, General Hospital Sibenik, Sibenik, Croatia
Abstract: Lymphogranuloma venereum is a sexually transmitted disease caused by L1, L2, and L3 serovars of Chlamydia trachomatis. In the last 10 years outbreaks have appeared in North America, Europe, and Australia in the form of proctitis among men who have sex with men. Three stages of disease have been described. The disease in primary stage may go undetected when only a painless papule, pustule, or ulceration appears. The diagnosis is difficult to establish on clinical grounds alone and frequently relies upon either serologic testing, culture, or more recently, nucleic acid amplification testing of direct specimens. A proper treatment regimen cures the infection and prevents further damage to tissues. Lymphogranuloma venereum causes potentially severe infections with possibly irreversible sequels if adequate treatment is not begun promptly. Early and accurate diagnosis is essential. Doxycycline is the drug of choice. Pregnant and lactating women should be treated with erythromycin or azithromycin. Patient must be followed up during the treatment, until disease signs and symptoms have resolved. Repeated testing for syphilis, hepatitis B and C, and HIV to detect early infection should be performed.
Keywords: sexually transmitted disease, Chlamydia trachomatis, early and accurate diagnosis
Lymphogranuloma venereum (LGV) is a sexually transmitted disease (STD) caused by L1, L2, and L3 serovars of Chlamydia trachomatis that primarily infects the lymphatics and can be transmitted through unprotected vaginal, anal, or oral sexual contact. C. trachomatis is the most common cause of bacterial STDs in both men and women.1 C. trachomatis is an obligate intracellular gram-negative bacterium that during its developmental cycle alternates between two forms: the infectious elementary body (EB) and the noninfectious replicating form, the reticulate body. The attachment process of the elementary body to a host cell is the event most crucial to a successful infection. Elementary bodies attach to columnar epithelial cells followed by endocytosis and inhibition of lysosomal fusion. A number of chlamydial ligands have been identified and characterized. These include the major outer membrane protein (MOMP) as well as the cysteine-rich OmcB (Omp2) protein, hsp70, the polymorphic outer membrane proteins, and the thermolabile 34-kDa membrane protein. In addition to these proposed ligands, there is a considerable amount of experimental evidence to suggest that the glycosaminoglycan, heparan sulfate, is involved in the chlamydial attachment-infectivity process. C. trachomatis does not produce heparan sulfate. Heparan sulfate acts as a host cell receptor for MOMP.2 The disease was described in 1833 by Wallace, but it was defined as a clinical and pathological entity in 1913 by Durand, Nicolas, and Favre. LGV is a subtype of genital ulcer diseases that includes other STDs such as Herpes simplex virus-2 (HSV-2), syphilis, and chancroid. LGV synonyms include lymphopathia venerea, tropical bubo, climatic bubo, strumous bubo, poradenitis inguinales, Durand-Nicolas-Favre disease, and lymphogranuloma inguinale. LGV is endemic in tropical and subtropical areas of the world (certain areas of Africa, Southeast Asia, India, the Caribbean, and South America). The incidence has been low in developed world, but in the last 10 years outbreaks have appeared in North America, Europe, and Australia in the form of proctitis among men who have sex with men (MSM).1,3–5 Three stages of disease have been described. The disease in primary stage may go undetected when only a painless papule, pustule, or ulceration appears.6 The diagnosis is difficult to establish on clinical grounds alone and frequently relies upon either serologic testing, culture, or more recently, nucleic acid amplification testing (NAAT) of direct specimens.7–9 LGV in MSM is associated with a high rate of coinfection with gonorrhea, syphilis, Herpes simplex, hepatitis C, and/or HIV coinfection. When LGV is suspected, diagnostic tests for other potentially coexisting STDs must be performed. Differential diagnoses for LGV include cat scratch disease, chancroid, syphilis, HSV-2, and granuloma inguinale.
LGV probably affects both sexes equally, although it is more commonly reported in men because early manifestations of LGV are more apparent in men. Men typically present with the acute form of the disease, whereas women often present when they develop complications from later stages of the disease. LGV may appear at any age, but the highest incidence is between 15 and 40 years (sexually active population). Most cases in Europe and North America have been identified among white, frequently HIV-positive MSM patients presenting with proctitis. Since 2003, there have been a series of LGV outbreaks reported across Europe.10–13 Since formal surveillance was launched in 2004, the United Kingdom has seen the highest number of confirmed MSM cases globally.13 Between April 2003 and June 2012, more than 2,000 cases of LGV had been confirmed in the United Kingdom.12 A large increase in diagnosed cases occurred in late 2009, peaking at 150 cases per quarter in mid-2010; since then, UK rates have remained steady at approximately 80 cases per quarter until 2012. Seventy-seven percent of cases have been diagnosed in London, Brighton, and Manchester. In one report from the United Kingdom (outbreak of 327 new cases of LGV), 76% MSM were also HIV positive, 39% had a diagnosis of another STD, and approximately 19% were also infected with hepatitis C virus. This is a major public health concern because enhanced shedding of HIV during clinical proctitis could increase the risk of HIV transmission to uninfected men.14 Before the outbreaks in MSM, LGV was primarily endemic in heterosexuals in areas of East and West Africa, India, parts of Southeast Asia, and the Caribbean where it is manifested as the classic form of disease with genital ulcers and lymphadenopathy (without proctitis). In these regions, a survey from Madagascar showed that C. trachomatis is not the main cause of genital ulcers. In that survey, 76% of 196 patients with genital ulcers had chlamydial antibodies, but only 8% of patients had LGV confirmed by multiplex polymerase chain reaction (PCR).15,16
From the beginning of the year 2007 until the end of 2011, 146 cases of LGV were notified in Barcelona.17 There are new cases in Finland,18 Czech Republic,19 and France where the first case of C. trachomatis L2b proctitis was described in a woman.20 Authors from the Netherlands reported a case study of a female patient with bubonic LGV caused by serovar L2b, which was probably contracted via her bisexual male partner.21 There are also complicated cases such as LGV infection mimicking deep-vein thrombosis22 and reactive arthritis associated with LGV.23
LGV among MSM in Europe is caused in the majority of cases by the C. trachomatis serovar L2b, which shows a high degree of clonal relatedness as found by Multi Locus Sequence Typing in a molecular epidemiological study. This is in contrast to the strains circulating among MSM in the United States, which show more molecular diversity. Based on these findings, it is now speculated that the LGV epidemic among MSM in Europe caused by the L2b variant may have been imported to Europe from the United States by the end of the previous century via the highly internationalized network of sexual contacts among MSM.4,24 The same serotype of C. trachomatis was identified in rectal swabs between 1979 and 1985 from patients infected with HIV in San Francisco and between 2000 and 2005 in 92 MSM patients with LGV in Amsterdam.24 A small number of cases of L serovar LGV have been reported in heterosexuals in the United Kingdom and Europe (including seven women in the United Kingdom since 2004), but these appear linked to bisexual male partners or sexual contact with those returning from endemic regions.13,14 Prior to 2003, most cases in Europe were imported via travelers, sailors, and soldiers.4,25
In the United States, the true incidence is unknown because national reporting of LGV ended in 1995. Between November 2004 and January 2006, LGV was identified in 180 people, with 27 people identified as being obtained from homosexual males. A study published in 2011 reporting LGV surveillance data from multiple sites in the United States found that less than 1% of the samples obtained from rectal swabs of MSM that were positive for C. trachomatis tested positive for LGV.26
C. trachomatis is divided into 15 serovars (A, B, Ba, C–K, and L1–L3) based on analysis of the MOMP. Serovars L1–L3 cause LGV. The L2 serovar can be further separated into L2, L2′, L2a, or L2b according to minor differences in their component amino acids. LGV is predominantly a disease of the lymphatic tissue.6 In contrast to serovars A–K, which remain confined to the mucosa, the LGV serovars C. trachomatis induce a lymphoproliferative reaction, it gains entrance through skin breaks and abrasions or it crosses the epithelial cells of mucous membranes. LGV serovars and other strains of C. trachomatis appear to bind to epithelial cells via heparan sulfate receptors27 and then it travels via lymphatics to multiply within mononuclear phagocytes in regional lymph nodes. After lymphangitis, areas of necrosis occur within the nodes, followed by the formation of abscess.27 In one study of 12 patients, lymph node macrophages contained organisms that stained black with Warthin–Starry stain,28 the organisms were clustered within vacuoles and both reticulate and elementary bodies were visible by electron microscopy. PCR testing of the lymph nodes for LGV serovars of C. trachomatis was positive in 9/12 cases. The pathologic findings are compatible with LGV or Bartonella henselae (ie, “cat scratch” disease), but are not diagnostic of either entity.29 The lymph node reaction may take several weeks to develop and can result in substantial inflammation and subsequent fibrosis.6 In a small number of cases, dissemination and systemic disease can occur. Neither the degree of infectiousness nor the reservoir of disease has been accurately defined, but heterosexual transmission has been attributed largely to asymptomatic female carriers and in the MSM population; asymptomatic rectal infection and/or penile infection is the likely source of onward transmission.30
First stage (primary LGV)
The incubation period lasts 3–30 days, after which a primary lesion occurs in the form of a small painless papule, pustule, nodule, shallow erosion, or herpetiform ulcer (Table 1). The initial lesions may be differentiated from the more common herpetic lesions by the lack of pain associated with the lesion. Differentiation from a syphilitic chancre requires serologic testing. The primary lesion of LGV is most commonly located on the coronal sulcus of men and on the posterior vaginal wall, fourchette (known as the frenulum of labia minora/posterior commissure of the labia minora) or vulva and on the cervix of women. The lesion usually heals within 1 week and may go unnoticed in the urethra, vagina, or rectum. Mucopurulent discharge from urethra, cervix, or rectum may be present regarding the inoculation site. Some ulcers in the recent MSM outbreak have been described as indurated and of variable tenderness; their duration has been as long as several weeks.31 Extra-genital lesions have been reported such as ulcers and fissures in the perianal area in MSM,32 the lip or oral cavity (tonsil), and extra-genital lymph nodes.33,34
Table 1 Clinical features of lymphogranuloma venereum
The new clinical picture is mostly seen among the MSM. Hemorrhagic proctitis in MSM is the primary manifestation of infection following direct transmission to the rectal mucosa. It might also occur in women with rectal exposure.35 In the recent outbreaks of LGV in MSM in Western Europe, approximately 96% of all cases presented with proctitis; symptoms included rectal pain, anorectal bleeding, mucoid and/or hemopurulent rectal discharge, tenesmus, constipation, and other symptoms of lower gastrointestinal inflammation. However, patients may present to gastroenterologists or colorectal surgeons for persisting symptoms.36 Endoscopic features are nonspecific, with a wide range of differential diagnoses including Crohn’s disease, lymphoma, anorectal carcinoma, and other sexually transmitted ulcerative infections (eg, syphilis, herpes).37,38 LGV proctitis mimics chronic inflammatory bowel disease, both clinically and in the pathological substrate. These cases may present with an incomplete or undisclosed history of proctosigmoiditis, without the characteristic adenopathy syndrome. During the initial evaluation and colonoscopy, there is a strong clinical and endoscopic suspicion of inflammatory bowel disease by virtue of presentation and endoscopic and histological findings. The diagnosis of IBD is subsequently modified to LGV proctosigmoiditis when one or more of the following transpire: 1) there is a failure of response to inflammatory bowel disease therapy; 2) additional components of history are identified (MSM/travel); 3) initially performed chlamydia antibody test shows seroconversion in the follow-up sample; and 4) response to antibiotics effective against chlamydia.39 Some patients reported systemic symptoms (fever and malaise). Genital ulcers and inguinal symptoms were less common.36
Several cases of pharyngeal MSM LGV infection have been reported recently. LGV serovars can cause symptomatic ulceration and pharyngitis but also asymptomatic carriage at this site.33
Secondary lesions (secondary LGV)
Secondary LGV begins within 2–6 weeks after the onset of primary lesion. Depending on the site of inoculation, LGV can cause inguinal syndrome (after primary lesion of the anterior vulva, penis, or urethra) or anorectal syndrome (usually after primary lesion of the posterior vulva, vagina, or anus).
Inguinal syndrome presents with painful inflammation of the inguinal (superficial and deep) lymph nodes and occurs mostly in men (occurs in only 20% of women with LGV). It is the most common clinical manifestation of genital LGV among heterosexuals. In two-thirds of cases, this produces unilateral enlargement, inflammation, suppuration, and abscesses. The disease process may involve one or many lymph nodes, and if adjacent to one another, they may coalesce. The central areas of such lymph nodes may then undergo necrosis. Fluctuant and suppurative lymph nodes then develop, causing the classic “bubo” of LGV. These “buboes” may rupture in one-third of patients, which may lead to sinus tract formation. In other cases, they may develop into hard, nonsuppurative masses. When both inguinal and femoral lymph nodes are involved, they can be separated by the inguinal (Poupart’s) ligament, “Groove sign”. This sign is pathognomonic of LGV, but occurs in only 15%–20% of cases.40
Women often have primary involvement of upper vagina, cervix, or posterior urethra; however, if they are receptive to anal sex they may have primary involvement of the rectum. These regions drain to the deep iliac or perirectal nodes and cause intra-abdominal or retroperitoneal lymphadenopathy that may lead to symptoms of lower abdominal pain or low-back pain.41
The systemic spread of LGV C. trachomatis may be associated with low-grade fever, chills, malaise, myalgias, and arthralgias. In addition, systemic spread occasionally results in arthritis, pneumonitis, abnormal hepatic enzymes, and perihepatitis. Rare systemic complications include cardiac involvement, aseptic meningitis, and ocular inflammatory disease.40 Reactive arthritis in MSM following LGV proctitis has been reported in several cases in recent years.42
In the rare pharyngeal syndrome affecting the mouth and throat, cervical lymphadenopathy and buboes can occur.18
Tertiary-stage/genito-anorectal syndrome/anogenitorectal syndrome/third-stage LGV
This stage manifests predominantly in women, but also in homosexual men, because of the location of the involved lymphatics. It is characterized by a chronic inflammatory response and the destruction of tissue, which is followed by the formation of perirectal abscess, fistulas, strictures, and stenosis of rectum. Lymphorroids are hemorrhoid-like swellings of obstructed perirectal, and intestinal lymphatics may also occur. If it is not treated, chronic progressive lymphangitis leads to chronic edema and sclerosing fibrosis. This results in strictures and fistulas that can cause elephantiasis of the genitals, esthiomene (chronic ulcerative disease of vulva leading to disfiguring fibrosis and scarring), and frozen pelvis syndrome.9,41 Penile and scrotal edema and distortion have been termed “saxophone penis”.43 LGV proctitis can lead not only to rectal stricture but also to development of mega colon.44 Within the current MSM outbreak, tertiary complications of anorectal LGV such as strictures and fistulas have been observed rarely.45
Finally, regarding clinical features, it has to be noted that in the present LGV epidemic among MSM, UK cohorts showed almost all LGV to be symptomatic,3,14 but Dutch studies had a significant proportion of asymptomatic infection detected.46,47 In a study conducted in the Netherlands that included LGV among MSM diagnosed in 2003–2004, only one patient, with onset of illness in April 2003, had symptoms usually associated with LGV (ie, inguinal adenopathy and a painful genital ulcer); all other patients had gastrointestinal symptoms (eg, bloody proctitis with a purulent or mucous anal discharge and constipation).45
Modern techniques now rely on nucleic acid amplification tests (NAATs) in well-equipped laboratories.35 The assays have high sensitivity and specificity. C. trachomatis is an intracellular organism, so samples should contain cellular material. For the detection of LGV serovars of C. trachomatis, different DNA samples can be used: 1) primary anogenital lesion swab (ulcer base exudate), 2) rectal mucosa swab (when anorectal LGV is suspected), or 3) enlarged or fluctuant lymph nodes or buboes aspirate (when inguinal LGV is suspected).9,41 After topical disinfection, a 21-gauge needle should be inserted into the lymph node through healthy adjacent tissue and the pus aspirated into a syringe; a small volume (<0.5 mL) of saline solution may be injected and re-aspirated for nonfluctuant nodes. Urethral swab or first-catch urine specimen can be used as a sample when urethritis and/or inguinal lymphadenopathy is present and LGV is suspected as the cause. Urine specimen usually shows negative PCR results in case of anorectal manifestation of LGV.35 A two-step procedure is usually followed. The first step includes C. trachomatis NAAT test (test only confirms presence of C. trachomatis, and does not allow serogroup identification). NAATs are not approved for testing samples from extra-genital sites, but studies have demonstrated high sensitivity and specificity in rectal chlamydial infections.9,41,47–49 C. trachomatis NAATs can be performed using one of three methods: PCR, strand displacement amplification, or transcription-mediated amplification. The second step is performed only if the first step test detects C. trachomatis in the sample. The second step diagnostic test is LGV biovar–specific DNA NAAT from the same sample used in first step test. Two tests for the second step are available: a real-time PCR-based test (detects all C. trachomatis LGV biovar strains)9,41,50 and a real-time quadriplex PCR-based assay. Both PCR techniques are reliable; the assay correctly identified 100% of non-LGV chlamydial specimens, 100% with no chlamydial infection, and 96.36% LGV specimens.47,51
For patients with genital disease, genital and lymph node specimens (lesion swabs and bubo aspirate) may be tested for C. trachomatis by 1) culture or 2) direct immunofluorescence (relatively insensitive). It is not always possible to culture the organism. Culture at primary stage is not often possible because the primary lesion often goes unnoticed. Culture on cyclohexamide-treated McCoy cells has a sensitivity of 75%–85% at best when the specimen is from LGV-suspected lesions and less for bubo aspirates.35,52 This method requires a lot of time, work, and money, and the availability is questionable.
If NAATs are not available, then Chlamydia genus-specific serological assays can be used. Four techniques are available: 1) the complement fixation, 2) the single L-type immunofluorescence test, 3) the micro-immunofluorescence test, and 4) anti-MOMP IgA assay (UK). With appropriate clinical presentation, a complement fixation antibody titer of higher than 1:64 is considered diagnostic. Titers that are greater than 1:256 are highly suggestive. In addition, a four-fold increase in the complement fixation titer of blood samples taken 2 weeks apart is indicative.2 A four-fold rise in antibody or single-point titers of >1/64 and >128 for the micro-immunofluorescence test has been considered positive.35,53,54 When clinical features are suggestive of LGV, high Ig anti-MOMP antibodies titer supports the diagnosis. Recent study from the Netherlands showed the anti-MOMP IgA serological assay to be the most useful for rectal LGV infection. The test has 75.5% sensitivity and 74.3% specificity in asymptomatic MSM with rectal C. trachomatis, and 85.7% sensitivity and 84.2% specificity in symptomatic MSM. The IgA anti-MOMP assay can identify a considerable proportion of the (asymptomatic) anal LGV infections correctly. Yet, biovar L-specific NAAT are still the preferred diagnostic tests in clinical settings.35,55,56 It is important to stress that neither a low titer excludes LGV nor does a high titer in patient without symptoms confirm LGV.48,49
The identification of rectal polymorphonuclear leucocytes from rectal swabs is predictive of LGV proctitis, especially in HIV-positive MSM. In a study of 87 MSM with confirmed LGV, majority of samples (Gram-stained anorectal swabs) had more than 10 white blood cells (WBCs) per high-power field.35,47
Histology of the lymph nodes is not specific: follicular hyperplasia, abscesses, cryptitis, and crypt abscesses without distortion of crypt architecture (last two were the most common findings in 12 anorectal biopsies from LGV in MSM).30,49
A proper treatment regimen cures the infection and prevents further damage to tissues. LGV causes potentially severe infections with possibly irreversible sequels if adequate treatment is not begun promptly. Early and accurate diagnosis is essential.4,9,41 The management of the ongoing epidemic LGV in industrialized Western countries caused by the C. trachomatis variant L2b still needs improvements in diagnosis, therapy, and prevention. Therefore, the rapid C. trachomatis variant L2b-specific PCR has been developed to circumvent laborious ompA gene sequencing.57 C. trachomatis should be treated with antibacterial drugs reaching high intracellular concentrations. In general, intracellular-acting agents such as doxycycline, erythromycin, and azithromycin and certain quinolones are advised.58 Doxycycline is the drug of choice for patients who are not pregnant.9,35,41 Pregnant and lactating women should be treated with erythromycin or azithromycin. Only one case of clinical failure with extended doxycycline therapy has been reported in an HIV-negative MSM with anorectal LGV. He subsequently responded to treatment with moxifloxacin 400 mg daily for 10 days; no isolate was available for resistance testing.35,59 Three MSMs who developed inguinal LGV failed the recommended 21-day doxycycline treatment. A recent paper suggests that inguinal LGV may require prolonged courses of doxycycline, exceeding the currently advised 21-day regimen.3 Current STD treatment guidelines for MSM in the United States recommend treatment of rectal chlamydia with a single 1-g dose of azithromycin, but there are increasing concerns about its effectiveness with treatment failures reported.59–61 A recent retrospective study conducted in the United States compared azithromycin and doxycycline for the treatment of rectal chlamydial infection; persistent/recurrent infection was higher among men treated with azithromycin (22%) compared with doxycycline (8%). These data suggest that doxycycline may be more effective than azythromycin in the treatment of rectal chlamydial infections.61 Factors that may be contributing to treatment failure for rectal chlamydia include: pharmacokinetic properties of azithromycin and doxycycline in rectal tissue, the ability of chlamydia to transform into a persistent state that is less responsive to antimicrobial therapy, the impact of the rectal microbiome on chlamydia, and heterotypic resistance.60 Recommended treatment regimens for LGV are listed in Table 2. As adjunctive therapy, the aspiration of fluctuant buboes is recommended for pain relief and prevention of rupture or chronic sinus formation, in contrast to surgical incision of buboes due to potential complications. The pharynx is a reservoir for chlamydia and LGV and may play a role in ongoing transmission. Although spontaneous clearance may occur in untreated patients with pharyngeal chlamydia, in high-risk STD clinic patients, testing the pharynx for chlamydia should be considered.56
Table 2 Recommended treatment regimens for lymphogranuloma venereum
A recent study suggests that HIV seropositivity was the strongest risk factor for LGV and that proctoscopic findings and elevated WBC counts in anorectal smear specimens were the only clinically relevant predictors for LGV infection. For all MSM reporting receptive anorectal intercourse, rectal chlamydia screening is recommended. If chlamydia test results are not available, for MSM reporting receptive anorectal intercourse who have proctitis noted by proctoscopic examination and a WBC count of >10 cells/high-power field in an anorectal Gram stain specimen or who have proctitis noted by proctoscopic examination and HIV seropositivity, treatment with doxycycline (100 mg twice per day) is advised until chlamydia test results are available, with a minimum duration of treatment of 7 days. If the anorectal chlamydia test result is negative, no treatment should be administered or doxycycline treatment should be stopped after a minimum of 7 days. If the anorectal chlamydia test result is positive and LGV testing is available, doxycycline treatment (100 mg twice per day) should be started or continued until LGV is rejected. A 7-day course of doxycycline is effective for treatment of a non-LGV chlamydia. Therapy should be continued until 21 days after confirmation of LGV. If the anorectal chlamydia test result is positive and if LGV testing is unavailable, doxycycline treatment (100 mg twice per day for up to 21 days) should be started or continued for MSM who meet one of the following criteria: proctitis noted during initial proctoscopic examination, >10 WBCs/high-power field in the initial Gram-stained anorectal smear specimen, or HIV seropositivity.9
Persons who have had sexual contact with a patient who has LGV within 4 weeks before the onset of the patient’s symptoms, or the last 3 months if asymptomatic LGV is detected, must be tested for C. trachomatis/LGV and start treatment (doxycycline 100 mg twice daily for 21 day). Patients must be followed up during the treatment, until disease signs and symptoms have resolved. Repeated testing for syphilis, hepatitis B and C, and HIV to detect early infection should be performed. A test of cure for LGV is not considered necessary if the recommended 21-day course of doxycycline is completed.9,41
The outbreaks of LGV among MSM in developed countries support the need for careful screening of these patients. A routine screening for rectal chlamydia is recommended in asymptomatic men at risk, as this may represent an important reservoir for the onward transmission of infection. Treatment of this group of patients is essential in the attempt to eradicate the disease. Patients should get information about safer sex behavior. Condom use may reduce the risk of LGV transmission, but uncovered ulcerated areas remain a problem. With early and accurate diagnosis and appropriate antibiotic therapy, the prognosis is excellent, but reinfection and relapses may occur.70
The authors have no conflict of interest related to this paper.
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