Medical Definition of conjugate vaccine
: a vaccine containing bacterial capsular polysaccharide joined to a protein to enhance immunogenicity; especially : one that is used to immunize infants and children against invasive disease caused by Hib bacteria and that contains the Hib capsular polysaccharide polyribosylribitol phosphate bound to diphtheria or tetanus toxoid or to an outer membrane protein of the meningococcus
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