What's the recommended flu vaccine schedule?
In most cases, the flu vaccine is received once each year. Children over 6 months should have flu shots in September (or as soon as flu vaccine is available) or any time in the influenza season -- into December, January, and beyond. Flu viruses change every year, which means that new vaccines are needed each year to protect against current strains. Even if you or your child received a flu vaccine in a previous year, you both still need to get revaccinated to develop immunity to the current year's strain.
If your child is under age 9 and receiving the flu shot or nasal spray vaccine for the first time, it's recommended that he get two doses at least four weeks apart. "This is the best way to build up immunities that first year," says Neal Halsey, MD, director of the Institute for Vaccine Safety at the Johns Hopkins Bloomberg School of Public Health in Maryland a member of the Parents magazine board of advisors. But only one dose is needed in subsequent years.