several studies have indicated their efficacy at preventing HIV transmission. That said, clinical trials are still ongoing, so it’s not a possibility just yet.However, one study published this month has taken available data to estimate how PrEP injections may help reduce HIV transmission amongst gay and bi men.The study, published in the Journal of Infectious Diseases, estimated that if half the men currently taking PrEP in the southeastern US switched instead to having an injection, there would be a 4.3% reduction in HIV transmission over ten years.That might not sound like a big difference, but bear in mind the study was looking at switching men already on PrEP to a different form of the medication.