<prompt> All are false regarding polio virus except:Most cases are symptomaticInactivated vaccine given IMInactivated polio vaccines are given to child less than 3 years of ageOnly one type exists  <response>: Ans. b Inactivated vaccine is given IM Inactivated poliovaccine or IPV salk type is given subcutaneously or IM. Other options Option L. Most cases of polio are asymptomatic Option c Dose schedule of IPV: First dose when infant is 6 weeks old Additional doses are recommended prior to school entry and then every five years until the age of 18. Option d These are three serotypes of polio virus Most outbreaks of paralytic polio are due to type 1. 