This post describes the case of a woman who appears to have been naturally cured of her HIV infection.
The high mutation rate of RNA viruses enables them to evolve in the face of different selection pressures, such as entering a new host or countering host defenses. It has always been thought that the sources of such mutations are the enzymes that copy viral RNA genomes: they make random errors which they cannot correct. Now …
On episode #327 of the science show This Week in Virology, the eTWiVicators review evidence that the HIV-1 group O epidemic began with a single cross-species transmission of virus from western lowland gorillas. You can find TWiV #327 at www.microbe.tv/twiv.