<prompt> Which of the following strains of wild poliovirus forms the salk type 1 component of inactivated polio vaccine?MEF - 1MahoneySaukettLeningrad - 3  <response>: IPV is usually made from Mahoney salk type I, MEF - 1 salk type II and saukett salk type III that are grown in cell culture. The harvested viral components are inactivated with formaldehyde. Leningrad - 3 is a strain of mumps virus used for making mumps vaccine. Ref: Park, Edition 21, Page - 185 