Every year the influenza vaccine is available and everyone is

Every year the influenza vaccine is available and everyone is encouraged to get it. Why does this vaccine have to be given yearly?

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Answer #1

O_o yeah I just noticed… stupid me duh

Answer #2

It is because the sesons have a effect on the viris and winter is the time of year the viris is most active, so people distribut the vaccine then.

YOU HAVE BEEN ANSWERED!!!

Answer #3

influenza is a bacteria that changes its genetic code each year so it can affect you anew, so the vaccines using dead or weakened viruses can help your immune system fight it…

Answer #4

Influenza, like some other virii (such as HIV!) mutates rapidly, so vaccines that worked against one strain may not work against another one. Each year, scientists and vaccine makers try and predict which strain is most likely to be dominant that year, and manufacture vaccine for it. Sometimes they’re right, and sometimes they’re not.

informer: It’s a virus, not a bacteria. :)

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