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Some people won’t get COVID-19

Just because one person in your house gets COVID-19, doesn’t always mean you will.

two COVID-19 tests that read negative, some people just don't get COVID

The CDC reported that transmission in close household settings is 53%. That means that some may not get infected.


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Why does the virus develop in some but not others?

A physician with MercyOne, Dr. Joseph McGargill, explains here that it is “multifactorial.” There are three main factors:

  • Known or unknown pre-exposure- someone may have had COVID-19 before, and didn’t know. This means they probably had antibodies against the infection, so they didn’t get sick.
  • Current exposure, although in close contact- it is possible that someone didn’t get a large enough antigen or virus exposure.
  • Genetics- some bodies respond better to the COVID-19 virus. They may not show symptoms even after a positive test.

If someone close to you tests positive, it is important to act like you could end up sick. COVID-19 is most contagious two days before someone shows symptoms and three days after.


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