What is a Covid-19 vaccine 'breakthrough' case?

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Why are some people who are fully vaccinated against Covid-19 getting infected with the virus? Health officials say breakthroughcases are not a cause for alarm and are expected

In the US, people who weren't vaccinated make up nearly all hospitalisations and deaths from Covid-19.

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 US are protective against them. One critical question about breakthrough cases is whether the person actually had symptoms, Dr Francis Collins, director of the National Institutes of Health, told The Associated Press.

But the agency cites limited evidence that they’re less likely to infect others than unvaccinated people who get an asymptomatic infection. Even if the virus sneaks past vaccine-spurred antibodies and starts replicating in your nose or throat, secondary defenses jump into action and usually, “the virus is stopped in its tracks within a few days,” said University of Pennsylvania immunologist Scott Hensley.

 

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