«Influenza vaccines have been in use for over 50 years, but there are very few studies that have been able to follow the same people for a long period of time particularly in such a well documented group of vaccinees.» (sciencedaily.com)
The number of volunteers has slowed to roughly 100 people a week, say CDC officials, making it unlikely that the agency will reach its original goal of up to 10 million vaccinees anytime soon. (sciencemag.org)
Results from the RV144 trial, reported in 2009, provided the first signal of HIV vaccine efficacy: a 31 percent reduction in HIV infection among vaccinees. (sciencedaily.com)