<prompt> MI are true about SALK vaccine except-OPV cannot be given as booster doseInjections during epidemic can cause paralysisInduces circulating antibody but no local immunityDoes not prevent multiplication of wild virus in gut  <response>: Ans. is a i.e., OPV cannot be given as booster dose One or two doses of live vaccine OPV can be given safely as boosters after an initial course of immunization with inactivated vaccine. 