Centers for Disease Control and Prevention

The Delta variant of the coronavirus is as contagious as chickenpox, probably causes more severe disease than past strains, and breakthrough cases in vaccinated individuals may be as transmissible as unvaccinated cases, according to a…
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Severe allergic reaction to Moderna's Covid-19 vaccine is "rare," US health authorities said Friday, with only 10 cases arising from more than four million first doses.
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US health authorities on Monday urged Americans most at risk of getting seriously ill from the new coronavirus to stock up on food and medicine and prepare to remain at home, as the pathogen spread rapidly across the country.
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US health authorities said Monday they have sequenced the genome of the first two cases of the Chinese coronavirus reported in the country and confirmed the virus has not mutated since leaving China.
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