Vaccine Immunity Is Waning. How Much Does That Matter?

Vaccine Immunity Is Waning. How Much Does That Matter?
(AP Photo/Juan Karita)

Six months ago, Miles Davenport and his colleagues made a bold prediction. On the basis of published results from vaccine trials and other data sources, they estimated that people immunized against COVID-19 would lose approximately half of their defensive antibodies every 108 days or so. As a result, vaccines that initially offered, say, 90% protection against mild cases of disease might only be 70% effective after 6 or 7 months1.

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