What Is Typically the Source of Pandemic Influenza a Virus

question 26

Multiple Choice

What is typically the source of pandemic Influenza A virus strains? (Select all that apply)

• A) antigenic shift in the H and N genes
• B) antigenic drift in the H and N genes
• C) recombination of viral segments between birds and swine
• D) point mutations in pre-existing influenza virus strain genomes

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