NEW YORK (Reuters Health) - Many volunteers who take part in clinical trials of experimental HIV vaccines report negative social consequences because of their participation in the studies, according to a new report."Since a majority of the negative social impact events were due to negative reactions from friends and family who misinterpreted what a preventive HIV vaccine trial entails, trial sites need to continue their educational efforts with both study participants and with local communities emphasizing that you cannot become HIV-infected from the vaccine itself and that these trials seek HIV-negative individuals to participate,” Dr. Jonathan Fuchs told Reuters Health.