| | Why won't the annual flu vaccine protect people against pandemic influenza? Category: Vaccines Questions
AnswerInfluenza vaccines provide the best protection against viruses closely related to the vaccine strains. Current annual influenza vaccines include influenza A subtype H3N2 and H1N1 viruses. A vaccine made from these viruses would not provide protection from other influenza A viruses (such as H5N1) that are not closely related to them.
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Last Updated: 03/21/2008
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