Joan Stephenson, PhD

On the one hand, with 40 million people infected worldwide with HIV and the number growing by some 15,000 newly infected individuals each day, the need for a vaccine has never been more urgent. On the other hand, there are a number of hurdles that have made HIV vaccine research a painfully slow process that demands patience as well as perseverance.

http://jama.ama-assn.org/issues/v288n21/ffull/jmn1204-1.html