COVID-19 vaccine development part 1

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.

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