Vaccine type

Vaccines come in different dosage forms. The polio vaccine for injection is inactivated virus; Oral polio vaccine is an attenuated live virus. Typhoid vaccine is an inactivated bacteria. Measles and other typical "children's" diseases (such as mumps, chickenpox and rubella vaccines) are attenuated live viruses. Diphtheria and tetanus vaccines contain "inactivated" toxins. Influenza vaccines often contain inactivated "split" viruses (protein in virus shell has been dissolved into liquid by solvent). Vaccines against Haemophilus influenzae type B, pneumococcal diseases and meningococcal diseases contain high-purity polysaccharide substances from bacterial shells or capsules.

Vaccines as antigens are often used in combination. The most commonly used combination is diphtheria-tetanus-pertussis (DTP); Diphtheria-tetanus-pertussis-hepatitis B (DTP-hepatitis B); Pentavalent vaccine: diphtheria-tetanus-pertussis-hepatitis B-Haemophilus influenzae B; And measles-mumps-rubella (MMR).