An epidemic that's been sustained for 44 years might finally be quelled, with the milestone approval of the first HIV drug that offers 100% protection with its twice-yearly injections. It's a landmark achievement that stands to save millions of lives across the globe. The makers are also providing…
i’m sorry if i remember this wrong but iirc there is a so called “r-factor” which determines how many new individuals an already infected individual infects.
if that reproduction factor is <1, then the virus dies out. so it doesn’t have to be 0, just small enough.