PS: Gates Donates $287M To AIDS Research

Dr. Juliana McElrath, associate head of the infectious diseases program at the Fred Hutchinson Cancer Research Center, is shown in a lab at the center today in Seattle. More than 20 years after scientists began searching for an HIV vaccine, the Bill & Melinda Gates Foundation this week announced a major effort to bring together researchers from around the world with a collaborate in a search for an AIDS vaccine here (AP Photo).