The outbreak of a new strain of influenza that occurs each year is due to

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The outbreak of a new strain of influenza each year is due to mutations in the influenza virus. The virus undergoes frequent mutations, which makes it difficult for the human immune system to recognize and fight it effectively. This is the reason why new strains of influenza emerge each year, requiring the development of a new vaccine tailored to the specific mutations.

The Outbreak of a New Strain of Influenza That Occurs