Bejel

Bejel
Name	Bejel
Field	Dermatology, Infectious disease
Synonyms	Endemic syphilis, endemic treponematosis
Symptoms	Mucocutaneous lesions, nasal destruction, bone deformities
Complications	Osteitis, gummatous lesions, chronic disfigurement
Onset	Childhood, adolescence
Causes	Treponema pallidum subspecies endemicum
Diagnosis	Serology, dark-field microscopy, PCR
Differential	Yaws, venereal syphilis, leprosy
Prevention	Improved hygiene, antibiotic treatment campaigns
Treatment	Penicillin, azithromycin

Bejel Bejel is an endemic treponemal infection caused by a nonvenereal subspecies of Treponema pallidum that causes mucocutaneous and osteitic disease primarily in arid and semiarid regions. Historically documented in parts of Middle East, North Africa, and Central Asia, the condition produces chronic lesions and deformities that have influenced public health campaigns by organizations such as the World Health Organization and Centers for Disease Control and Prevention. Clinical management overlaps with approaches used for syphilis and yaws, while microbiologic distinction relies on molecular methods developed in laboratories like the London School of Hygiene & Tropical Medicine and the Pasteur Institute.

Introduction

Bejel, known historically as endemic treponematosis or endemic syphilis, is a communicable infection caused by Treponema pallidum subspecies endemicum first characterized in clinical surveys by early 20th-century investigators associated with institutions such as the Rockefeller Foundation and the British Medical Journal reports. Outbreaks and endemic foci have been described in locales including Saudi Arabia, Yemen, Sudan, Uzbekistan, and parts of Algeria and Morocco, prompting interventions from agencies like the World Health Organization and nongovernmental groups including Médecins Sans Frontières. Epidemiologic patterns resemble those of other treponematoses studied by teams at the Centers for Disease Control and Prevention and university centers such as Johns Hopkins University and Karolinska Institutet.

Etiology and Microbiology

The etiologic agent is Treponema pallidum subspecies endemicum, a spirochete closely related to Treponema pallidum subspecies pallidum (causative agent of venereal syphilis) and to causal agents of yaws and pinta. Molecular typing methods developed at institutions like the National Institutes of Health, Wellcome Trust Sanger Institute, and the Pasteur Institute use PCR amplification and sequencing of genes such as tp0136, tp0548, and 23S rRNA to differentiate subspecies. Phylogenetic analyses published by groups at Harvard Medical School and University of Oxford show conserved genomic regions shared with strains studied in Panama and Papua New Guinea. Reservoirs are human; arthropod vectors have not been implicated despite investigations by entomologists at Imperial College London and Smithsonian Institution.

Epidemiology

Endemic foci have been recorded historically in Saudi Arabia, Yemen, Sudan, Ethiopia, Somalia, Algeria, Morocco, and parts of Central Asia such as Uzbekistan and Turkmenistan. Prevalence peaked in surveys by the World Health Organization and national ministries of health in the mid-20th century before control efforts by the World Health Organization and the Rockefeller Foundation reduced burdens in many areas. Transmission occurs primarily through nonsexual contact in childhood settings similar to patterns reported for yaws in Papua New Guinea and Ghana, with household and school-associated spread documented in field studies by London School of Hygiene & Tropical Medicine teams and by researchers from University of Liverpool. Risk factors include crowded living conditions observed in reports by UNICEF and limited access to water and sanitation noted by UNESCO assessments.

Clinical Features

Initial lesions often present as mucous patch or small mucocutaneous ulcers on oropharyngeal or nasal mucosa, comparable to manifestations reported in classical descriptions by clinicians at Guy's Hospital and the Royal Free Hospital. Secondary stages include widespread mucocutaneous inflammation and regional lymphadenopathy described in case series from the Mayo Clinic and Cairo University Hospitals. Tertiary disease can involve gummatous destruction of nasal and palatal structures and osteitis of the tibia and skull, similar to deformities chronicled in monographs from Johns Hopkins Hospital and surgical reconstructions at Massachusetts General Hospital. Differential diagnosis often invokes venereal syphilis cases reviewed by St Thomas' Hospital and granulomatous diseases such as leprosy cases managed at The Leprosy Mission clinics.

Diagnosis

Laboratory confirmation uses serologic tests like non-treponemal tests (e.g., RPR) and treponemal assays (e.g., FTA-ABS), as standardized in protocols by the World Health Organization and diagnostic laboratories at the Centers for Disease Control and Prevention. Dark-field microscopy performed in reference centers such as Public Health England can demonstrate spirochetes from lesions, while PCR assays and whole-genome sequencing developed at Wellcome Trust Sanger Institute and Institut Pasteur distinguish subspecies. Clinical algorithms used in field campaigns by Médecins Sans Frontières and the World Health Organization combine epidemiologic context from ministries of health in Saudi Arabia and Sudan with serology and molecular testing. Diagnostic challenges include cross-reactivity with venereal syphilis serology and limited laboratory access in remote areas surveyed by researchers from University of Cape Town and Addis Ababa University.

Treatment and Management

First-line therapy is parenteral benzathine penicillin administered per regimens recommended by the World Health Organization and national treatment guidelines used in Saudi Arabia and Sudan. Oral azithromycin has been used in mass drug administration campaigns modeled on strategies by the World Health Organization and implemented by agencies like Médecins Sans Frontières and national programs in Yemen and Ethiopia. Management of complications may require reconstructive surgery performed by teams at Cairo University Hospitals and Massachusetts General Hospital, and orthopedic care reported from Addis Ababa University teaching hospitals. Treatment protocols follow principles applied to yaws eradication efforts coordinated by the World Health Organization and research institutions including London School of Hygiene & Tropical Medicine.

Prevention and Public Health Implications

Prevention strategies emphasize early case detection, treatment of contacts, hygiene promotion campaigns by UNICEF and the World Health Organization, and targeted mass drug administration modeled on eradication initiatives for yaws and supported by partnerships with the Bill & Melinda Gates Foundation and national ministries of health in endemic countries. Surveillance systems integrated into public health infrastructure at agencies such as the Centers for Disease Control and Prevention and regional offices of the World Health Organization are required to detect recrudescence, as shown by historical eradication-like campaigns organized with the Rockefeller Foundation. Social determinants identified in epidemiologic studies by Harvard School of Public Health and London School of Hygiene & Tropical Medicine—including poverty and limited access to water noted by UNICEF—remain central to sustained control.

Category:Tropical diseases