The live types 1 & 3 oral polio vaccine (bOPV) is a bivalent vaccine containing suspension of types 1 & 3 attenuated Polio viruses (Sabin strains), prepared in primary monkey kidney cell. Each dose (2 drops = 0.1 mL) contains not less than 106.0 infective units of type 1 and 105.8 of type 3. Sucrose is used as stabilizer. bOPV may contain trace amounts of not more than 2 mcg Erythromycin and not more than 10 mcg Kanamycin.