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Swine Flu (H1N1/09)

Can you catch the same flu twice?

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2011-01-01 21:20:45
2011-01-01 21:20:45

If you are exposed to an identical version of the flu that you had previously after you have recovered fully from it the first time, then your body should have developed immunity to all genetically identical kinds of flu and you would not get it a second time. However, the flu can change by mutations and if it does change enough that the immune system no longer sees it as identical, then you would not have immunity to the mutated strain. This is a similar concept to why we need different seasonal flu vaccine every year and why there are no vaccines for the common cold.

You can get the flu twice in one season, but it would not be the same flu virus.

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