Cool HIV fact

that I learned from the item immediately preceeding this one.

How fast does HIV mutate?

The global sequence diversity of influenza, another variable RNA virus, during a pandemic is lower than the diversity of viruses observed within a single HIV-infected individual

So there is more variability between the HIV viruses in a single infected person than among all the different influenza viruses circulating all over the world. That's fast.

Quote from this review of HIV; original article here.