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What happens if there are two different strains of flu in one season?

April 26, 2017different flu happens season strains

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What happens if there are two different strains of flu in one season?

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We can never really predict how many strains of flu there will be and by the time we find another strain in the middle of the flu season, it is too late to make a vaccine for the new one. We hope that the vaccine will have some cross protection against the new strain.