<prompt> All 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>: - salk polio vaccine is inactivated polio vaccine. - induce humoral immunity but not intestinal or local immunity. - for community, it does not offer protection because wild virus can still multiply in gut and be a source of iinfection to others. - not suitable for an epidemic. - one or two doses of OPV can be given safely as boosters after an initial immunisation with inactivated vaccine. Reference : Parks textbook of preventive and social medicine, 23rd edition, pg no:206 p 