Vaccines 2018

An oral polio vaccine (OPV) manufactured by the company Bio-Med was found to be contaminated with the Type 2 poliovirus (vaccine strain). Type 2 poliovirus has been eradicated, and no outbreaks of this wild strain have been recorded since 1999. Consequently, modern live polio vaccines are typically bivalent, containing only two strains: Type 1 and Type 3. The Indian vaccine manufacturer Bio-Med, based in Ghaziabad, produces polio vaccines for India’s government immunization programs.