Risk of HIV transmission through condomless sex in serodifferent gay couples with the HIV-positive partner taking suppressive antiretroviral therapy (PARTNER): final results of a multicentre, prospective, observational study

Our results provide a similar level of evidence on viral suppression and HIV transmission risk for gay men to that previously generated for heterosexual couples and suggest that the risk of HIV transmission in gay couples through condomless sex when HIV viral load is suppressed is effectively zero. Our findings support the message of the U=U (undetectable equals untransmittable) campaign, and the benefits of early testing and treatment for HIV.

Here's an article in Australian Fairfax Media: "Fears new wonder drug could lead to STI epidemic"

It refers to this article in The Lancet: "Community-level changes in condom use and uptake of HIV pre-exposure prophylaxis by gay and bisexual men in Melbourne and Sydney, Australia: results of repeated behavioural surveillance in 2013–17"

Here's the key take-away from the Fairfax article:

An international 2016 study of men who have sex with men found the chances of contracting chlamydia, gonorrhoea and syphilis were increased 11, 24, and 44-fold respectively in PrEP users. Fears have now been raised that these staggering numbers might be replicated in Australia.

Here's a news article about an HIV vaccine being tested on humans "in the field": Scientists hopeful as HIV vaccine candidate passes key test

Here's the scientific report: Evaluation of a mosaic HIV-1 vaccine in a multicentre, randomised, double-blind, placebo-controlled, phase 1/2a clinical trial (APPROACH) and in rhesus monkeys (NHP 13-19)