noun
bivalent vaccine
Medical term for a vaccine that targets two strains or serotypes of a pathogen.
新型コロナウイルス対策として、二価ワクチンの接種が進められている。
Vaccination with bivalent vaccines is being promoted as a measure against the novel coronavirus.
Monovalent vaccine, targeting a single strain.
Polyvalent vaccine, targeting multiple strains.
Compound of 二価 (にか, 'bivalent') and ワクチン ('vaccine'). 二価 is a medical term meaning 'having a valence of two', from 二 ('two') and 価 ('valence').