MICHAEL SMITH: I'm Michael Smith with MedPage Today, and I'm here today with Dr. Carl Dieffenbach, who is Director of the Division of AIDS at the National Institute of Allergy and Infectious Diseases. Dr. Dieffenbach, welcome to MedPage Today.
CARL DIEFFENBACH, PhD: It's a pleasure to be here with you, Michael.
SMITH: We're going to talk today a little bit about HIV, and, specifically, how it does what it does; nasty little virus. Can you just describe the process of infection to begin with?
DIEFFENBACH: Sure. It's actually a very interesting situation with HIV. HIV is a relatively difficult virus to transmit, except when it isn't, and there are some very specific circumstances that tend to promote HIV transmission, so let's just go through the basic process first.
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