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Why doesnt vaccination against influenza guarantee lifetime immunity to the flu?
Wiki User
∙ 13y ago
Good question. The reason is that the virus that causes the flu is constantly mutating and changing. So the vaccine that is used this season is based on what the virus looked like at the time it was manufactured. But the virus is clever and it learns how to change, so that's why we gotta keep changing the vaccine each season.
Wiki User
∙ 13y ago
Wiki User
∙ 12y agoBecause the strain of flu varies from year to year; even vaccinations have to be altered to meet the constant new forms of influenza.
Wiki User
∙ 12y agoInfluenza mutates constantly where most of the others don't. That's why u can get a flu jag and still get the flu - there are many strains out there at any given time.xxx
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