Dictionary.com defines polyvalent as:Acting against or interacting with more than one kind of antigen, antibody, toxin, or microorganism.A polyvalent vaccine, also known as multivalent vaccine, is a
vaccine that has more than one type of
pathogen. These vaccines are useful because they can vaccinate a person against more than one strain of a disease, whereas without the vaccine, one would have to have multiple shots to vaccinate themself.
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