Why we use vaccines?
- Vaccines can prevent infectious disease. Examples of vaccine-preventable disease are: measles, polio, hepatitis B, influenza and many others.
- When most people in a community are vaccinated against a disease, the ability of the pathogen to spread is limited. This is called ‘herd” or “indirect” or “population” immunity.
- When many people have immunity, this is also indirectly protects people who cannot be vaccinated, such as very young babies and those who have compromised immune system.