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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.
These are called âtrivalentâ flu vaccines. Now, some flu vaccines protect against 4 strains. These are called âquadrivalentâ flu vaccines. After the CDC forecasts which flu strains are likely to circulate, flu vaccine manufacturers decide whether to design a flu vaccine that includes 3 strains (2 A and one B) or 4 strains (2 A and 2 B). A quadrivalent vaccine that helps protect against 2 A strains and 2 B strains may reduce the risk of being unprotected against the flu. To learn more, visit the CDC website at. http://www.cdc.gov/flu/