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What is a COVID-19 vaccine ‘breakthrough’ case?

by Assoicated Press
July 24, 2021

What is a COVID-19 vaccine "breakthrough’’ case?

It’s when a fully vaccinated person gets infected with the coronavirus. A small number of such cases are expected and health officials say they’re not a cause for alarm.

COVID-19 vaccines work by teaching the body to recognize the virus. So if you’re exposed to it after vaccination, your immune system should be ready to spring into action and fight it.

In studies, the two-dose COVID-19 vaccines by Pfizer and Moderna were around 95% effective at preventing illness, while the one-shot Johnson & Johnson shot was 72% effective, though direct comparisons are difficult. So while the vaccines are very good at protecting us from the virus, it’s still possible to get infected with mild or no symptoms, or even to get sick.

If you do end up getting sick despite vaccination, experts say the shots are very good at reducing the severity of the illness – the main reason to get vaccinated.

Most people with breakthrough infections experience mild illness, said Dr. William Moss, a vaccine expert at the Johns Hopkins Bloomberg School of Public Health.

In the U.S., people who weren’t vaccinated make up nearly all hospitalizations and deaths from COVID-19.

It’s difficult to determine why any particular breakthrough case happens. How much of the virus you’re exposed to could be a factor, Moss said. Our individual immune systems will also affect how well we respond to the shots. Some people, for example, have health conditions or take medications that could make their immune systems less responsive to the vaccines.

People might also have been exposed to the virus before the shots took full effect. Though less likely, they may have received a dose that was improperly stored or administered, Moss said.

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