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CDC now calls coronavirus Delta variant a 'variant of concern'
NIH researchers find more evidence Covid was circulating in the US in December 2019
Novavax says Covid-19 vaccine shows 90.4% overall efficacy in US/Mexico Phase 3 trial
Pediatric cardiologists explain myocarditis and why your teen should still get a Covid-19 vaccine
Uncovering the origins of the virus that sparked a pandemic
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