Vaccines are divided into five categories. These are-
- Live vaccine: The vaccine prepared by inactivating live bacteria is called live vaccine. For example, vaccination against measles, mumps, rubella, chicken pox, typhoid etc.
- Killed vaccine: The vaccine made by dead cells of virus or bacteria is called killed vaccine. For example, vaccination against influenza, cholera, polio, rabies, hepatitis etc.
- Toxoid vaccine: Toxoid vaccine is made by inactivating the toxic substances of bacteria with formaldehyde. For example, vaccination against diphtheria, tetanus, etc.
- Sub unit vaccine: This vaccine is made from a small part of the germ cell (protein). E.g. Hepatitis B, Papilloma Virus Vaccination.
- Conjugate vaccine: The vaccine made by two different components of the virus is called Conjugate vaccine. E.g. Haemophilus vaccine.