Chlamydia trachomatis infection and distribution of serovars in the Eastern Highlands Province, Papua New Guinea

We have used nested polymerase chain reaction (PCR) and the PCR-based endonuclease digestion method to genotype Chlamydia trachomatis serovars in 460 infected individuals from the Eastern Highlands Province of Papua New Guinea. Our study groups comprised women who presented in labour to the Goroka Base Hospital, their newborn infants, symptomatic children who presented to the hospital's Outpatients Department and men and women from 15 randomly selected villages in the Asaro Valley. In this analysis, the major outer membrane protein (MOMP) gene, omp1, of C. trachomatis was amplified using DNA obtained from the endocervix of women, urine from men, and both the eye and nasopharynx of children. Amplified DNAs were digested concurrently using Alul and a combination of EcoRI, Hinl and Hpall restriction enzymes. The mixtures were separated on electrophoretic gels and the respective serovars designated on the basis of resolved digested DNA patterns. Our results, which were confirmed also by omp1 sequence data, show serovars D, E, F, G, H and L3 to be present in the studied communities. The overall relative frequencies of these serovars were 30%, 21%, 25%, 1%, 20% and 2% respectively, with serovars D, E, F and H accounting for 97% of these infections. Double infections among these principal serovars were also detected in all our study groups but at a low overall frequency of 3%. Serovar D was the major agent involved in the aetiology of chlamydial infection in both children and adults though serovar F was the most frequent in newborn infants. Serovar H was relatively less frequent in symptomatic children. No trachoma-related serovars were detected, confirming the rarity of this disease in Papua New Guinea. In contrast, although clinical cases of lymphogranuloma venereum have not been described in the country, the detection of serovar L3 in this study suggests that it may occur. However, the association of L3 also with childhood infection indicates that it may be causing the same pathology as the serovars D-K that are associated with non-ulcerative sexually transmitted infections.

Sex Workers' Sexual Health and Peer Education Project in Goroka, Eastern Highlands Province, Papua New Guinea

We conducted a survey among female sex workers in Goroka, Eastern Highlands Province, Papua New Guinea to evaluate the frequency of sexually transmitted disease (STD) symptoms they suffered, their STD and HIV (human immunodeficiency virus) transmission knowledge and health-seeking behaviours, the forms that their HIV risk perception took, and the types and quantities of educational resources to which they had access and in fact used. This survey was a part of a larger study of sex workers that was carried out in two other cities, Lae, the capital of Morobe Province, and Port Moresby, the nation's capital. We interviewed 190 self-identified female sex workers who had been recruited between January 1999 and October 1999 through peer-mediated contacts. In an average one-week period, the women had intercourse with two customers, two to three times, and one boyfriend once or twice. In the surveyed group, 83% of the women had a history of symptomatic STDs and 73% had gone to an STD clinic for treatment. Of the women who used condoms at all, 7% used them each time they had sex with clients, but only 3% used them each time they had sex with steady partners. The remaining 93% of the women used condoms on some occasions or not at all. Most women (72%) knew about male-female transmission of HIV, but fewer cited other sexual and non-sexual modes of transmission. The majority of the women (71%) felt that they were of low or unknown risk of acquiring HIV infection. When asked where or to whom they would go when concerned about AIDS (acquired immune deficiency syndrome) or STDs, most women (93%) said that they would go to a health care provider. Evaluating the sex workers' understanding of STDs and HIV has been essential in designing education and intervention projects so as better to address the future morbidity and mortality associated with STDs and AIDS.