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August 19, 2021 07:00 am

COVID-19 Vaccines May Trigger Superimmunity In People Who Had SARS Long Ago

sciencehabit shares a report from Science Magazine: Almost 20 years before SARS-CoV-2, a related and even more lethal coronavirus sowed panic, killing nearly 10% of the 8000 people who became infected. But the 2003 outbreak of severe acute respiratory syndrome (SARS) may have left some survivors with a gift. Former SARS patients who have been vaccinated against COVID-19 appear able to fend off all variants of SARS-CoV-2 in circulation, as well as ones that may soon emerge, a new study suggests. Their formidable antibodies may even protect against coronaviruses in other species that have yet to make the jump into humans -- and may hold clues to how to make a so-called pancoronavirus vaccine that could forestall future outbreaks. A team led by emerging disease specialist Linfa Wang from Duke-NUS Medical School in Singapore identified eight SARS survivors who recently received two shots of a messenger RNA COVID-19 vaccine. In the test tube, antibodies sieved from their blood potently "neutralized" an early strain of SARS-CoV-2 as well as SARS-CoV, the virus that caused SARS, Wang and colleagues report today in The New England Journal of Medicine. The team further found these neutralizing antibodies worked well against the Alpha, Beta, and Delta variants of SARS-CoV-2 and stymied five related coronaviruses found in bats and pangolins that potentially could infect humans.

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