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UK study finds mRNA Covid-19 vaccines provide biggest booster impact

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Covid-19 vaccines made by Pfizer and Moderna that use mRNA technology provide the biggest boost to antibody levels when given 10-12 weeks after the second dose, a British study published on Thursday has found. The “COV-Boost” study was cited by British officials when they announced that Pfizer and Moderna…

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Covid-19: UK study suggests Delta subvariant less likely to cause symptoms

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Asubvariant of Delta that is growing in Britain is less likely to lead to symptomatic COVID-19 infection, a coronavirus prevalence survey found, adding that overall cases had dropped from a peak in October. The Imperial College London REACT-1 study, released on Thursday, found that the subvariant, known as AY.4.2, had…

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