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The Ottawa County health department on Thursday reported 25 new cases of the coronavirus and one new death related to COVID-19 since its last report on Monday.

That equates to an average of a little more than eight new cases per day over the past three days.

Ottawa County presently only updates its COVID-19 data on Mondays and Thursdays.

As of Thursday, Ottawa County's pandemic total number of cases is 33,081, with 32,481 recovered and 434 deaths.

The state health department now reports COVID-19 data only on Tuesdays and Fridays. In its last report, the department said there have been 898,626 confirmed cases of the virus and a death toll of 19,862 in Michigan since March 2020.

The state health department on Tuesday reported that Muskegon County's pandemic total number of cases was 16,387, with 371 deaths.

What is a COVID vaccine 'breakthrough' case?

By CANDICE CHOI Associated Press

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 percent effective at preventing illness, while the one-shot Johnson & Johnson shot was 72 percent 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.

The Centers for Disease Control and Prevention notes variants could be factors in some breakthrough cases, though evidence so far indicates the vaccines used in the U.S. are protective against them.

Health officials are also watching for signs that breakthrough cases are rising, which could signal that protection from the vaccines is fading and boosters are needed.

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The AP is answering your questions about the coronavirus in this series. Submit them at: FactCheck@AP.org

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