Study offers clues to why COVID-19 vaccine protection wanes quickly
A health worker prepared a dose of a Moderna COVID-19 vaccine in Barboursville in the U.S., November 4, 2021. | Photo Credit: Sholten Singer/AP The ideal vaccine offers nearly complete protection against infection and mild disease in just one dose. It is simple to administer and doesn’t have any adverse effects. The protective immunity lasts…
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