The flu vaccine is comprised of killed or inactivated virus (three most likely strains of flu virus based on predictions from the previous flu season).

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Traditionally, vaccines were manufactured from the complete organism, such as an inactivated flu virus.

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For them, only injections of H1N1 and seasonal flu vaccines are appropriate, since they contain inactivated or dead virus.

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The two types of vaccine that have been approved -- a flu shot made from inactivated or dead virus and a nasal spray made from live, weakened virus -- will be available free of charge, though some providers may charge an "administration fee, " Sebelius said.

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According to the CDC, it takes less than a minute for E. coli to be inactivated if chlorine levels are adequate, about 16 minutes to control Hepatitis A virus, about 45 minutes to kill off the Giardia parasite and over 10 days for a Crypto parasite.

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