u/Hopeful_Meeting_7248

Since the coronavirus pandemic, there's one thing that bugs me. At that time I read that there's a correlation between infection rate and mortality rate of a virus, namely - more infectious viruses are less deadly. The justification I heard was that if they were as deadly as infectious, the host would die too soon to spread the virus, so that's evolutionarily unfavourable. But there are viruses like HIV that take ages to develop and are extremely deadly, but become transmissible very quickly, just the transmission route is quite challenging. And that's usually the case with viruses with high mortality rate - they're hard to get. But is there anything that would make something like airborne HIV impossible?