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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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