Herd immunity (also called herd effect, community immunity, population immunity, or social immunity) is a form of protection from infectious disease. This happens when a large percentage of a population has become immune to an infection, whether through previous infections or vaccination.
When many individuals have immunity, they do not spread the disease any more. This either stops or slows the spread of disease.
References[change | change source]
- Fine, P.; Eames, K.; Heymann, D. L. (1 April 2011). "'Herd immunity': A rough guide". Clinical Infectious Diseases. 52 (7): 911–16. doi:10.1093/cid/cir007. PMID 21427399.
- Gordis, L. (2013). Epidemiology. Elsevier Health Sciences. pp. 26–27. ISBN 978-1455742516. Retrieved 29 March 2015.
- Merrill, R. M. (2013). Introduction to Epidemiology. Jones & Bartlett Publishers. pp. 68–71. ISBN 978-1449645175. Retrieved 29 March 2015.