Quote:
Originally Posted by Donger
What about people who don't get flu shots? Haven't most of them been exposed to seasonal influenza, and shouldn't they therefore have antibodies?
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Flu viruses continually change over time. This constant changing enables the virus to evade the immune system, so that people are susceptible to the flu throughout life. This process works as follows: a person infected with a flu virus develops antibodies against that virus; as the virus changes, the "older" antibodies no longer recognizes the "newer" virus, and the person gets sick. The older antibodies can, however, provide partial protection against newer viruses.
Copied it, explains it bettering than I could.plus I lam lazy