what is herd immunity? How it can help to reduce coronavirus cases?
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What Is Herd Immunity and Could It Help Prevent COVID-19?
Medically reviewed by Stacy Sampson, DO on April 2, 2020 New — Written by Noreen Iftikhar, MD
How it works
Stats
Natural immunity
Effectiveness
COVID-19 and herd immunity
In the future
Takeaway
You’ve probably heard the term “herd immunity” used in relation to the coronavirus disease outbreak.
Some leaders — for example, Boris Johnson, the prime minister of the United Kingdom — suggested it might be a good way to stop or control the spread of the new coronavirus, which causes COVID-19. Herd immunity is also called community immunity and herd or group protection.
Herd immunity happens when so many people in a community become immune to an infectious disease that it stops the disease from spreading.
This can happen in two ways:
Many people contract the disease and in time build up an immune response to it (natural immunity).
Many people are vaccinated against the disease to achieve immunity.
Herd immunity can work against the spread of some diseases. There are several reasons why it often works.
There are also many reasons why herd immunity won’t yet work to stop or slow the spread of SARS-CoV-2 or COVID-19, the disease caused by an infection of the new coronavirus.
Answer:
There are basically three ways to stop the Covid-19 disease for good. One involves extraordinary restrictions on free movement and assembly, as well as aggressive testing, to interrupt its transmission entirely. That may be impossible now that the virus is in over 100 countries. The second is a vaccine that could protect everyone, but it still needs to be developed.
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