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With an uptick in Covid-19 cases, there is growing alarm. 'We've seen almost an entire takeover in the Delta variant,' one state official says
By Aya Elamroussi
Study shows booster shot after 6 to 12 months likely to provide best protection from COVID-19, Pfizer says
By Eric M. Strauss & Mark Osborne
99.2% of US Covid deaths in June were unvaccinated, says Fauci
By Lauren Aratani
Pfizer's COVID-19 booster shot strongly extends protection but CDC cautions 3rd dose not yet needed
By Karen Weintraub