Coronavirus: What is a COVID-19 vaccine 'breakthrough' case?

Coronavirus: What is a COVID-19 vaccine 'breakthrough' case?

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 …
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