Vincent, Alan, and Stephen Morse discuss progressive vaccinia in a smallpox vaccinee, arsenic and influenza in mice, facemasks and flu transmission, and antigenic and genetic analyses of the new H1N1 influenza virus.

Vincent, Alan, and Raul Rabadan converse about polio survivors in iron lungs, bocavirus, structure of mimivirus, and genome sequence analysis of influenza H1N1 viruses.

On this special episode of TWiV, Vincent and Dr. Peter Palese, noted influenza expert, discuss the origin and pandemic potential of the new H1N1 influenza virus.

Vincent, Dick, and Alan talk about insect and human dengue virus host proteins, equine vaccine for WNV and EEEV, return of swine flu to humans, spread of polio in Africa, and listener email.