Herd immunity: What you should know


Herd immunity describes a situation wherein the presence of a large proportion of immune provides (indirect) protection from infection to susceptibles.

The development of herd immunity is influenced by several factors. This complexity has implications for both mathematical calculations, and planning of interventions.

Where vaccination is the means of developing immunity, herd immunity will develop only if the vaccine also decreases infectiousness (the ability to transmit infection).

Useful Links:

Link to an article on herd immunity in the context of COVID-19:


Link to image explaining herd immunity

Image attribution:

National Institutes of Health (NIH) / Public domain

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