Cause of antigenic drift in influenza viral infections is
Correct Answer: Small mutation in neuraminidase and hemagglutinin
Description: antigenic drift - small changes in the genes of influenza viruses that happen continually over time as the virus replicates.Antigenic shift - an abrupt, major change in the influenza A viruses, resulting in new hemagglutinin and neuraminidase proteins in influenza viruses that infect humans.
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Microbiology
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