False about antigen drift?: (A) Causes pandemic, (B) Occurs due to mutation, (C) Occurs more frequently, (D) Affected by previous antibodies
Answer is A. Ans. is 'a' i.e., Causes pandemic o Antigenic shift (not drift) is responsible for pandemic. o Antigenic drift occurs due to point mutation. o Antigenic drift occurs more frequently (2-3 years) than antigenic shift (10-15 years). o Antigenic drift is influenced by the presence of antibodies to the predecessor strains in the host population.