Injectable vaccines containing inactivated viruses prevent about 50% more seasonal flu in healthy adults than the intranasal vaccine containing a weakened virus, according to a new report today in the New England Journal of Medicine.*
"We have two effective vaccines," said Dr. Arnold S. Monto of the University of Michigan, who led the study. "In children, I would prefer FluMist [intranasal vaccine] and in adults, injected, based on the data we have. However, an adult who does not want a shot should take FluMist." But he noted that it is not yet clear whether the same findings will hold for the pandemic H1N1 influenza virus, commonly known as swine flu.