<prompt> False about antigen drift?Causes pandemicOccurs due to mutationOccurs more frequentlyAffected by previous antibodies  <response>: 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. 