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.
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1. Why are vaccinated people testing positive for the coronavirus?
First, it’s important to remember that testing positive indicates an infection with SARS-CoV-2, the coronavirus that can cause Covid-19. The disease is diagnosed only when the infection causes symptoms such as fever and cough; a significant proportion of people who become infected never develop symptoms. Although vaccines provide a strong defense against severe illness caused by...read more...