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President Joe Biden tested positive for COVID-19 on Thursday, joining millions of other Americans—including his own vice president—who have contracted the illness since the coronavirus pandemic first began more than two years ago.
Biden, who at 79 is the oldest person to ever serve as president, has been vaccinated and doubly boosted against the virus that has claimed more than a million American lives. The Centers for Disease Control and Prevention has found triple vaccination greatly reduces the risk of hospitalization.
But as an elderly man with a history of brain aneurysms, Biden could face a particular risk of potential complications from the illness.