Microbiology Virology 819c4048

Antigenic shift -

Occurs every 2-3 years

Gradual change over time

Results from genetic recombination

Occurs in all influenza viruses

High-Yield Explanation

Antigenic shift is an abrupt, drastic, discontinuous variation in the antigenic structure resulting in a novel virus strain unrelated antigenically to predecessor strain. REF: Anantha Narayan AND PANIKER'S TEXTBOOK OF MICROBIOLOGY 9TH EDITION PAGE NO:499

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