protects children and adolescence 10 and older with just one older. children 6 months through 9 years old will need two doses. >> we're very pleased with the results, that it appears that younger individuals are responding to this vaccine in a manner very similar to how they respond to seasonal flu vaccine. for us, that's very good news. >> to some parents, this might seem confusing. while younger children need a booster after their first vaccination, relatively few younger children get the vaccine at all. the vaccine is highly recommended for everyone 6 months to 24 years. >> this is generally a disease in younger individuals, but a very small portion of them develop serious disease. >> reporter: it will be available as a familiar shot or flumist, the nasal spray. >> how many of you watched your hands before school today?