herd immunity

Questions Answered About Herd Immunity…

Questions Answered About Herd Immunity…


What Is Herd Immunity?


herd immunity

Herd immunity, or community immunity, is when a large part of the population of an area is immune to a specific disease. If enough people are resistant to the cause of a disease, or bacteria or virus, it has nowhere to go.

While not every single individual may be immune, the group as a whole has protection. This is because there are fewer high-risk people overall. The infection rates drop, and the disease peters out.

Herd immunity protects at-risk populations. These include babies and those whose immune systems are weak and can’t get resistance on their own.


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Herd Immunity and COVID-19

With the rising number of cases of COVID-19 around the world, health officials continue to work to find the best way to protect the public from the disease. You may have heard health officials mention herd immunity as a possible way to contain the spread of COVID-19.


How Do You Achieve Herd Immunity?

There are two ways this can happen.

  • You can develop resistance naturally. When your body is exposed to a virus or bacteria, it makes antibodies to fight off the infection. When you recover, your body keeps these antibodies. Researchers think the community reached the right level for herd immunity.


  • Vaccines can also build resistance. They make your body think a virus or bacteria has infected it. You don’t get sick, but your immune system still makes protective antibodies. The next time your body meets that bacteria or virus, it’s ready to fight it off.


What Are the Challenges to Developing Herd Immunity to COVID-19?

The main obstacle to herd immunity to COVID-19 right now is that the virus that causes the disease is “novel,” or new. That means that it hasn’t infected humans before and everyone is at risk of infection. There’s no existing immunity to build on.

Another potential barrier is that we don’t know how strong the immune protection is or how long it will last in people who’ve had COVID-19. Early research on monkeys showed that they made antibodies to the virus that protected them from a second infection a month later. If the coronavirus is like the flu, we can expect a few months of protection.

While there are now vaccines to protect against COVID-19, it will be months before enough people can receive them. We hope that the vaccines will eventually help bring the spread under control.

Researchers estimate that 75-80% of the population would need to be vaccinated before we can have herd immunity.


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