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The truth is, no one really knows. Flu strains are mutating all of the time. Each time a flu strain mutates to act in a different way, it is given another name (if we actually discover it and can recognize that it is different). The other problem is discovery. Often, different strains act in the same way. Therefore, it isn't really important to distinguish between strains. Only strains that seem to 1) be popular in the next flu season or 2) pose a great threat to humans are actually identified.

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15y ago

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