Anthony Fauci.J. Reed/Reuters The US National Institute of Allergy and Infectious Diseases (NIAID) announced last week that it will begin five clinical trials for two pandemic H1N1 influenza vaccines in early August. These trials will help inform a likely US mass-vaccination campaign beginning in September. NIAID director Anthony Fauci talks about what vaccines were chosen, and why.To increase the amount of flu vaccine available, the World Health Organization recommends using adjuvants, which boost the body's immune response to the drug. But the five trials you announced last week are for non-adjuvanted vaccines. Why? We have planned seven priority trials. The...