How Long Does Natural Immunity from a Covid Infection Last?

Back in the early days of sourdough starters and masked neighborhood strolls, we suspected Covid could only be contracted once. As the pandemic progressed, experts estimated natural immunity would last six months. Then 90 days. Now it’s all a guessing game with the emergence of new variants like BA.5.

John Bowen, a biochemist at UW Medicine, has been searching for elusive answers about Covid reinfections and immunity as the ever-changing pandemic unfolds—especially as research shows that a person’s risk for complications like stroke, heart attack, diabetes, long-term cognitive impairment, and long Covid increase with each Covid infection, even asymptomatic cases.

According to Bowen and his team, it’s

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