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Waning COVID vaccine efficacy especially against reinfection

A new study in American veterans posted to the medRxiv* preprint server suggests severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) vaccines are less effective in preventing infection after six months. The decline was most significant with the Johnson & Johnson vaccine, with vaccine effectiveness plummeting from 88% to 3%.
United States Jocelyn Solis Moreiraoct Jocelyn Solis Moreira Veterans Health Administration Us Food Drug Administration Veterans Health

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