Study: Single dose of H1N1 flu vaccine may suffice for adults

September 11, 2009

A single low dose of H1N1 vaccine may be enough to protect adults from the flu virus that has been spreading around the world, new data shows. Scientists are conducting clinical trials on the H1N1 vaccine in several sites across the country. Researchers in Australia said they tested the H1N1 vaccine in 240 people ages 18 to 64. Half were given a dose of 15 micrograms while the others were given 30 micrograms. (CNN)