Influenza A virus can occasionally cause a major pandemic due to its ability to undergo

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Influenza A virus can cause a major pandemic due to its ability to undergo antigenic shift. This process occurs when two or more different strains of the virus combine their genetic material to form a novel subtype that humans have no immunity for, leading to a widespread outbreak of disease. Antigenic drift and protein variation can also contribute to the emergence of new strains, but they are not as significant as antigenic shift in causing a pandemic. Antigen deletion and cellular transformation are unrelated to influenza virus.

Influenza a Virus Can Occasionally Cause a Major Pandemic Due