A serological test for granuloma inguinale

Donovanosis

Donovanosis, a chronic cause of genital ulceration, has recently been the subject of renewed interest after a long period of relative obscurity. The causative organism, Calymmatobacterium granulomatis, has been cultured for the first time in many years and a polymerase chain reaction diagnostic using a colorimetric detection system has been developed. Phylogenetic analysis confirms close similarities with the genus Klebsiella and a proposal made that C granulomatis be reclassified as Klebsiella granulomatis comb nov. Azithromycin has emerged as the drug of choice and should be used if the diagnosis is confirmed or suspected. In donovanosis endemic areas, syndromic management protocols for genital ulceration may need to be adapted locally. A significant donovanosis epidemic was reported in Durban from 1988-97 but the current status of this epidemic is unclear. The donovanosis elimination programme among Aboriginals in Australia appears successful and is a model that could be adopted in other donovanosis endemic areas. Overall, the incidence of donovanosis seems to be decreasing. Increased attention would undoubtedly be paid to donovanosis if policy makers recognised more readily the importance of genital ulcers in fuelling the HIV epidemic.

Sexually transmitted diseases in South Africa

AIM

To review the epidemiology of and data collection for sexually transmitted diseases (STDs) in South Africa.

METHODS

Literature published since 1980 on STDs in South Africa were complied and evaluated. Historical reports and salient unpublished literature were also used in the literature review. Studies were critically reviewed in the light of sample populations and study methods, and a baseline picture of the patterns of STD burden was developed.

RESULTS

The STD burden in apparently asymptomatic study populations is significant. Ulcerative infections, primarily caused by syphilis and chancroid, are present in 5-15% of asymptomatic clinic attenders; prevalence rates of gonorrhoea average 8%, with up to 13% of gonococcal isolates resistant to penicillin antibiotics. In addition, on average, chlamydia and vaginal infections are detected in 16% and 20-49%, respectively, of antenatal and family planning clinic attenders. HIV seroprevalence rates have reached 7.6% in antenatal clinic attenders. Most South African STD data are derived from ad hoc surveys which have traditionally focused only on several major infections and particular urban centres. Almost all STD studies have been facility-based, with many studies based at STD clinics, thus reporting only relative frequencies and not population-based prevalences of STDs. With the possible exception of HIV, systematic surveillance data for STDs are conspicuously lacking.

CONCLUSION

The disease burden of classic sexually transmitted infections has historically been heavy, and continues to be a serious public health problem in South Africa. Morbidity from both ulcerative and non-ulcerative infections, particularly in women, is significant. The body of STD data, although mostly sound, remains incomplete, and with the rapid emergence of HIV in South Africa, surveillance of STDs and focused STD policies will be critical.

Global eradication of donovanosis: an opportunity for limiting the spread of HIV-1 infection

Genital ulcer disease (GUD) is well recognised in the developing world as a co-factor for heterosexual HIV transmission. Men with GUD are an important high frequency HIV transmitter core group in the general population but few interventions have targeted such individuals so far. Donovanosis is an uncommon GUD with low infectivity characterised by large ulcers that bleed readily and has been identified as a risk factor for HIV in men in Durban, South Africa. Donovanosis is also endemic in Papua New Guinea, India, Brazil and amongst the Aboriginal community in Australia. This curious geographical distribution is unique to any of the sexually transmitted diseases (STD) and might lend itself to control measures not tried previously. In the 1950-60s a global eradication programme was successfully introduced against yaws but this strategy has not been implemented against any of the STD. Donovanosis is a symptomatic disease usually diagnosed on clinical grounds and could be targeted for eradication. Any programme would need to be community-based and require co-operation with both hospital doctors, private general practitioners, nurses, primary health care workers, pharmacists and traditional healers. Donovanosis is usually treated by readily available antibiotics but treatment failure may occur in advanced HIV disease. Drug compliance is often a problem but may be improved by counselling. Early implementation of an eradication programme targeting men with donovanosis could have a significant impact in limiting the spread of HIV in donovanosis-endemic countries and would pre-empt the possibility of both the emergence of drug resistance and treatment failure in individuals with immune impairment.