Breakthrough Covid Cases: Uncommon and Often Mild, but Not Always

Vaccination remains the best defense, health experts say. But some infections occur regardless, and can come as a traumatic surprise. Online-PR: … unsere digitale Pressearbeit im Internet hilft weiter…

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Vaccine Effectiveness Against Infection May Wane, C.D.C. Studies Find

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Federal health officials said the new data justified a campaign of booster shots. But some scientists disagreed, saying not every American needs another dose.