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H1N1 Vaccine: Live, Attenuated Intranasal Spray (cont.)

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When should the 2009 H1N1 nasal-spray flu vaccine be given?

Flu vaccination should begin as soon as vaccine is available and continue throughout the influenza season, into December, January, and beyond. By early October 2009, extensive 2009 H1N1 flu activity was being reported in the United States. It's possible that there may be waves of 2009 H1N1 activity during the 2009-2010 flu season that hit communities more than once over the course of the influenza season, which typically peaks in January or February but can last as late as May.

How many doses of nasal spray vaccine are needed?

In adults, only one dose of 2009 H1N1 vaccine, including the 2009 H1N1 nasal spray vaccine, is needed for protection.

All children 2 through 9 years of age getting a 2009 H1N1 vaccine will need two doses of 2009 H1N1 vaccine (either the 2009 H1N1 flu shot or the 2009 H1N1 nasal spray vaccine), The first dose should being given as soon as vaccine becomes available. The second dose should be given 28 or more days after the first dose. The first dose "primes" the immune system; the second dose provides immune protection. Children who only get one dose of vaccine when they need two doses may have reduced or no protection. Be sure to follow up to get your child a second dose if they need one. It usually takes about two weeks after the second dose for protection to begin.

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