Donovanosis is a bacterial disease etiologically defined by infection with *Klebsiella granulomatis* (formerly *Calymmatobacterium granulomatis*), a Gram-negative, non-motile, facultative anaerobe. It is clinically characterized by progressive, painless ulcerative lesions primarily involving the genitalia and perineum, with potential for autoinoculation and spread to adjacent tissues. The term "donovanosis" derives from the eponymous Donovan bodies—rod-shaped, oval, deep-purple-staining inclusions observed within mononuclear phagocytes in histopathologic specimens. The disease is recognized under multiple synonyms, including granuloma inguinale, granuloma venereum, and serpiginous ulceration of the groin, reflecting historical and regional nomenclature variations.
Disease Profile
BacterialDonovanosis
肉芽肿性腹股沟病
Donovanosis (granuloma inguinale) is a rare, chronic, sexually transmitted bacterial infection caused by *Klebsiella granulomatis*, historically classified as *Calymmatobacterium granulomatis*. It presents with painless, beefy-red genital ulcers that progress to destructive tissue necrosis and may involve the oral cavity secondary to genital lesions. The disease is endemic in tropical and subtropical regions of low- and middle-income countries, where underdiagnosis and lack of access to care contribute to its persistence. Diagnosis relies on clinical morphology, biopsy, and identification of Donovan bodies—characteristic intracellular inclusions—though serologic or molecular confirmation is not routinely available in resource-limited settings.
The disease typically manifests 10–40 days after exposure with small, painless nodules that rupture into open, fleshy red ulcers with rolled edges and a tendency to bleed on contact. Lesions are most commonly located on the penile shaft, labia, or perineum, though oral involvement may occur secondary to oral-genital contact. Without treatment, the infection leads to extensive tissue destruction, mucus and blood discharge, and increased susceptibility to superinfection. Inguinal lymphadenopathy is generally mild or absent, distinguishing it from syphilis; pseudobubo formation may occur without true lymph node involvement. The course is chronic and progressive if untreated, with potential for scarring and functional impairment.
Donovanosis is endemic in many less-developed regions, particularly in parts of Southeast Asia, the Pacific Islands, sub-Saharan Africa, and northern Australia. Its global burden remains poorly quantified due to underreporting, limited diagnostic capacity, and misclassification as other ulcerative STIs. In high-income countries such as the United States, fewer than 100 cases are reported annually, largely among travelers or migrants with exposure in endemic zones. The disease is strongly associated with sexual transmission, and risk is heightened by unprotected intercourse with individuals from affected areas. No animal reservoirs or environmental sources have been identified in current literature.
Transmission occurs primarily through direct skin-to-skin contact with active ulcerative lesions during sexual intercourse. Autoinoculation can lead to spread within the same individual, especially along the inguinal and perineal regions. Oral manifestations are typically secondary to genital lesions via oral-genital contact. There is no evidence of non-sexual or vector-borne transmission. The organism does not survive long outside the human host, and no documented cases of vertical transmission or nosocomial spread exist in the provided sources.
High-risk groups include individuals with recent travel or residence in endemic regions, men who have sex with men (MSM) with exposure to affected populations, and individuals engaging in unprotected sexual activity with partners from endemic zones. Women are also at risk, particularly through heterosexual contact, though gender-specific prevalence data are not available in the source material. No specific age group is highlighted as more vulnerable in the provided content, and no immunocompromised status has been linked to increased susceptibility in the cited sources.
Preventive strategies center on behavioral interventions: consistent condom use, pre-exposure screening for STIs before new partnerships, and avoidance of sexual contact with individuals from endemic regions. Antibiotic treatment—typically azithromycin, doxycycline, or ciprofloxacin—is highly effective, and early intervention prevents progression and reduces transmission risk. Public health efforts should prioritize education, improved diagnostics (including histopathologic confirmation), and integration with broader STI surveillance systems in high-risk geographic zones. Source-backed detail on vaccine development or post-exposure prophylaxis is not available.
In surveillance contexts, donovanosis should be considered when evaluating patients with painless, rapidly progressing genital ulcers lacking significant lymphadenopathy, particularly among those with travel history to endemic areas. Differential diagnosis must include syphilis, chancroid, and malignancy; the presence of Donovan bodies on biopsy remains the gold standard for confirmation. Due to its rarity in high-income settings and frequent misdiagnosis, case reporting requires careful clinical and histopathological documentation. Surveillance data remain sparse globally, limiting trend analysis; however, any confirmed case warrants public health follow-up to assess exposure networks and prevent further spread.
Figure 1 | Full historical trajectories across all reporting countries.
Figure 2 | Year-over-year monthly comparison for seasonality and structural shifts.
Dataset Archive
Supplementary Data | Multi-country disease dataset
Machine-readable multi-country disease dataset (JSON/CSV) with source metadata.
Source Register
Official sources and update cadences used to construct the downloadable dataset.
Australia
Australian national notifiable diseases surveillance dashboard.
Official source