<prompt> Bivalent oral polio vaccine contains which strains of polio virus-1 8c 22 31 33 4  <response>: Ans. is c i.e., 1 3 Bivalent oral polio vaccine BOPV contains suspension of type 1 and type 3 attenuated Polio viruses Sabin strains, prepared in primary monkey kidney cell. Trivalent OPV contains type 1, 2 3 attenuated polioviruses. It contains:-i Over 300,000 TCID 50 of type 1 poliovirusii Over 100,000 TCID 50 of type 2 poliovirusiii Over 300,000 TCID 50 of type 3 poliovirus 