Most of us now view COVID-19 as more of a nuisance than a danger, thanks to vaccines and past exposure to the virus—all of which have built up our immunity.

But research suggests that multiple COVID-19 infections pose a risk for developing Long COVID. In the largest Long COVID study of young people to date, scientists led by a team at the University of Pennsylvania report that young people who got infected twice with COVID-19 were twice as likely as those who got COVID-19 once to develop Long COVID symptoms that affect major organs like the heart, kidney, and lungs, as well as taste and smell.

The ongoing research project, called RECOVER, is funded by the National Institutes of Health and explores the impact of COVID-19 infections on long-term health. Yong Chen, professor of biostatistic

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