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Noun. 1. trivalent live oral poliomyelitis vaccine-an oral vaccine (containing live but weakened poliovirus) that is given to provide immunity to poliomyelitis. OPV, oral poliovirus vaccine, Sabin vaccine, TOPV.poliovirus vaccine-vaccine prepared from poliovirus to provide immunity to poliomyelitis.rivalent live oral poliomyelitis vaccine-definition of trivalent live oral poliomyelitis vaccine by The Free Dictionary.
The CDC explains it well: Quadrivalent Influenza Vaccine. The strains of influenza used in the annual vaccine are based on predominant strains noted during international surveillance: Selecting the Viruses in the Seasonal Influenza (Flu) Vaccine as well as availability of matched lab strains to use in making the vaccine.