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Covid-19 antibody-based drugs and vaccines developed so far may become less effective as new variants of the novel coronavirus spread widely, according to a new study. The research, published in the journal Nature Medicine, noted that the three fast-spreading variants of the coronavirus first reported in South Africa, the UK and Brazil, can evade antibodies that work against the original form of the virus that sparked the pandemic. According to the scientists, including those from the Washington University School of Medicine in St. Louis in the US, more of antibodies produced in response to vaccination or natural infection, or purified antibodies intended for use as drugs, is needed to neutralise these novel coronavirus varieties, compared to the levels needed to counter the original virus lineage from Wuhan, China. “We’re concerned that people whom we’d expect to have a protective level of antibodies because they have had Covid-19 or been vaccinated against it, might not be protected against the new variants,” said study senior author Michael S. Diamond from the Washington University School of Medicine in St. Louis. The researchers said there is wide variation in how much antibody a person produces in response to vaccination or natural infection. “Some people …
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