Here’s a talk for non-scientists about your immune system, viruses and vaccines by Abbie Smith, a graduate student from the University of Oklahoma who writes the ERV blog. (ERV = endogenous retrovirus) She also spends a little time talking about HIV, which she studies. She’s an enthusiastic and natural speaker. (Being a Freethought meeting these are a few of passing references to creationists but just gloss over that it it’s not your thing.)
Besides that it’s a nice effort to explain a fair complex subject, I’m offering this talk in small part because of measles cases in New Zealand.