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What is the most likely reason why the flu vaccine is less effective against the h3n2 flu viruses than the h1n1 flue viruses
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What is the most likely reason why the flu vaccine is less effective against the h3n2 flu viruses than the h1n1 flue viruses

User Maryam Bahrami
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Because the virus has adapted to the previous vaccine.

User Khn Rzk
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