Sony Salzman

But other research links prisons themselves to mental health challenges and infectious disease outbreaks.

"Genetics is less than half the story for sexual behavior, but it's still a contributing factor."

A chlamydia infection makes HIV acquisition more likely.

The results were less favorable than expected, but experts -- and women who participated in the trial -- would like to see this prevention tool approved for use.

The ECHO trial faces backlash and criticism.

Researchers reported hopeful news on regimens with lower treatment burdens and newly developed antiretrovirals.

Although several HCV drugs can cure almost all infections regardless of viral genotype, picking the right drug will depend on each patient's medical history, level of liver damage, and coinfections.

But given cost concerns, advocates question whether the benefits are enough to warrant dumping F/TDF as the go-to PrEP option.

ECHO trial results and follow-up studies find unexpectedly low rates of some STIs among users of certain long-term hormonal contraceptives. They also find high HIV rates (unrelated to the contraceptives) that suggest considerable value for PrEP integration.

New study results leave many experts feeling they went too far in their concerns over birth defect risks associated with the drug.