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NIH researchers find more evidence Covid was circulating in the US in December 2019

Researchers have found more evidence that coronavirus was circulating at low levels across the United States as early as December 2019 — weeks before the first officially reported cases. Frozen blood samples indicate people in five states — Illinois, Wisconsin, Pennsylvania, Mississippi and Massachusetts — were infected with coronavirus days or weeks before any cases

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Organ transplant patients may benefit from third Covid-19 vaccine dose to boost antibodies, study suggests

A third dose of coronavirus vaccine could help boost antibody levels among some organ transplant recipients who have not had robust responses to the standard vaccination schedules, a new study suggests. Among patients in the study who had no measurable antibodies after receiving two doses of vaccine, one-third of them saw a rise in antibodies

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A dangerous coronavirus variant on the rise could cause outbreaks in states with low vaccination rates, expert says

The Delta variant is quickly on its way to becoming the dominant strain of coronavirus in the US, raising concerns that outbreaks could hit vulnerable communities come fall. Currently 10% of Covid-19 cases in the US can be attributed to the variant, also called the B.1.617.2 variant, but that proportion is doubling every two weeks,

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A dangerous Covid-19 variant on the rise could cause outbreaks in US states with lower vaccination rates, expert says

The Delta variant is quickly on its way to becoming the dominant strain of Covid-19 in the US, raising concerns that outbreaks could hit vulnerable communities come fall. Currently 10% of Covid-19 infections in the US can be attributed to the variant, also called the B.1.617.2 variant, but that proportion is doubling every two weeks,

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