It’s not uncommon for a vaccine to forestall severe disease but not infection. Inoculations against the flu, rotavirus, polio and pertussis are all imperfect in this way - Apoorva Mandavilli


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This is why vaccinated people are still testing positive for COVID-19

With COVID-19 shots reaching billions of people, reports have grown more common of people getting infected with the coronavirus despite being vaccinated. Just as a natural infection doesn’t guarantee protection from reinfection with the virus, neither does immunization provide a perfect shield. Still, those who have immunity— either from vaccination or infection—carry a fraction of the risk of those who have none. So-called breakthrough cases among the immunized are a reminder that as long as the pandemic virus is prevalent in the world, it remains a threat to everyone.

1. Why are vaccinated people testing positive for the coronavirus?

First, it’s important…

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Last Updated : Sunday, August 8, 2021