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How quickly does COVID immunity fade? What scientists know
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How quickly does COVID immunity fade? What scientists know

Cassandra Willyard A kiosk in Shanghai, China, offers free SARS-CoV-2 testing. Credit: CFOTO/Future Publishing via Getty Three years into the pandemic, the immune systems of the vast majority of humans have learnt to recognize SARS-CoV-2 through vaccination, infection or, in many cases, both. But just how quickly do these types of immunity fade? New evidence...