Response to: Gregson S, Gonese E, Hallett TB et al. HIV decline in Zimbabwe due to reductions in risky sex? Evidence from a comprehensive epidemiological review.

摘要

The authors of this article1 review several sexual-behaviour surveys from Zimbabwe and ask whether the declines in HIV prevalence seen in that country between 1997 and 2007 are attributable to behavioural change. They conclude that declines in the fraction of men and women with casual-or 'non-regular'-partners, combined with high rates of condom use in casual sex are at least partly responsible for this favourable trend.We wonder why there is no mention of the dramatic decline in the fraction of people with 'concurrent' or overlapping relationships observed in the Manicaland study-one of the main studies discussed in this review.