OBJECTIVES: To assess the extent to which sexually transmitted infections (STIs) have contributed to the spread of HIV in South Africa and to estimate the extent to which improvements in STI treatment have reduced HIV incidence. METHODS: A mathematical model was used to simulate interactions between HIV and six other STIs (genital herpes, syphilis, chancroid, gonorrhoea, chlamydial infection and trichomoniasis) as well as bacterial vaginosis and vaginal candidiasis. The effects of STIs on HIV transmission probabilities were assumed to be consistent with meta-analytic reviews of observational studies, and the model was fitted to South African HIV prevalence data. RESULTS: The proportion of new HIV infections in adults that were attributable to curable STIs reduced from 39% (uncertainty range: 24-50%) in 1990 to 14% (8-18%) in 2010, while the proportion of new infections attributable to genital herpes increased. Syndromic management programmes are estimated to have reduced adult HIV incidence by 6.6% (3.3-10.3%) between 1994 and 2004, by which time syndromic management coverage was 52%. Had syndromic management been introduced in 1986, with immediate achievement of 100% coverage and a doubling of the rate of health seeking, HIV incidence would have reduced by 64% (36-82%) over the next decade, but had the same intervention been delayed until 2004, HIV incidence would have reduced by only 5.5% (2.8-9.0%). CONCLUSIONS: Sexually transmitted infections have contributed significantly to the spread of HIV in South Africa, but STI control efforts have had limited impact on HIV incidence because of their late introduction and suboptimal coverage.
OBJECTIVES: To assess the extent to which sexually transmitted infections (STIs) have contributed to the spread of HIV in South Africa and to estimate the extent to which improvements in STI treatment have reduced HIV incidence. METHODS: A mathematical model was used to simulate interactions between HIV and six other STIs (genital herpes, syphilis, chancroid, gonorrhoea, chlamydial infection and trichomoniasis) as well as bacterial vaginosis and vaginal candidiasis. The effects of STIs on HIV transmission probabilities were assumed to be consistent with meta-analytic reviews of observational studies, and the model was fitted to South African HIV prevalence data. RESULTS: The proportion of new HIV infections in adults that were attributable to curable STIs reduced from 39% (uncertainty range: 24-50%) in 1990 to 14% (8-18%) in 2010, while the proportion of new infections attributable to genital herpes increased. Syndromic management programmes are estimated to have reduced adult HIV incidence by 6.6% (3.3-10.3%) between 1994 and 2004, by which time syndromic management coverage was 52%. Had syndromic management been introduced in 1986, with immediate achievement of 100% coverage and a doubling of the rate of health seeking, HIV incidence would have reduced by 64% (36-82%) over the next decade, but had the same intervention been delayed until 2004, HIV incidence would have reduced by only 5.5% (2.8-9.0%). CONCLUSIONS: Sexually transmitted infections have contributed significantly to the spread of HIV in South Africa, but STI control efforts have had limited impact on HIV incidence because of their late introduction and suboptimal coverage.
Authors: Lindi Masson; Kelly B Arnold; Francesca Little; Koleka Mlisana; David A Lewis; Nonhlanhla Mkhize; Hoyam Gamieldien; Sinaye Ngcapu; Leigh Johnson; Douglas A Lauffenburger; Quarraisha Abdool Karim; Salim S Abdool Karim; Jo-Ann S Passmore Journal: Sex Transm Infect Date: 2015-10-28 Impact factor: 3.519
Authors: Zizipho Z A Mbulawa; Cari van Schalkwyk; Nai-Chung Hu; Tracy L Meiring; Shaun Barnabas; Smritee Dabee; Heather Jaspan; Jean-Mari Kriek; Shameem Z Jaumdally; Etienne Muller; Linda-Gail Bekker; David A Lewis; Janan Dietrich; Glenda Gray; Jo-Ann S Passmore; Anna-Lise Williamson Journal: PLoS One Date: 2018-01-02 Impact factor: 3.240
Authors: Maria Xiridou; Henrike J Vriend; Anna K Lugner; Jacco Wallinga; Johannes S Fennema; Jan M Prins; Suzanne E Geerlings; Bart J A Rijnders; Maria Prins; Henry J C de Vries; Maarten J Postma; Maaike G van Veen; Maarten F Schim van der Loeff; Marianne A B van der Sande Journal: BMC Infect Dis Date: 2013-09-18 Impact factor: 3.090