Classification according to their composition

Single vaccine (hepatitis B vaccine, pneumococcus vaccine • Combination vaccine (MMR, infanrix hexa,pentaxime) • Monovalent- contains a single strain of a single antigen (hepatitis B vaccine, • Polyvalent- contains multiple antigen ( MMR, DTP, infanrix hexa,pneumococcus vaccine) All the combination vaccines are polyvalent, single vaccines can be poly- or monovalent