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Study: Common cold in past may give protection from Covid-19
"When we looked at blood samples from people who were recovering from Covid-19, it looked like many of them had a pre-existing pool of memory B cells that could recognise SARS-CoV-2 and rapidly produce antibodies that could attack it," said lead study author Mark Sangster from the University of Rochester in the US. The findings are based on a comparison of blood samples from 26 people who were recovering from mild to moderate Covid-19 and 21 healthy donors whose samples were collected six to 10 years ago - long before they could have been exposed to Covid-19.
From those samples, study authors measured levels of memory B cells and antibodies that target specific parts of the Spike protein, which exists in all coronaviruses and is crucial for helping the viruses infect cells. The Spike protein looks and acts a little different in each coronavirus, but one of its components, the S2 subunit, stays pretty much the same across all of the viruses.Memory B cells can't tell the difference between the Spike S2 subunits of the different coronaviruses and attack indiscriminately.
The study found that was true for beta coronaviruses, a subclass that includes two cold-causing viruses as well as SARS, MERS and SARS-CoV-2. "Now we need to see if having this pool of pre-existing memory B cells correlates with milder symptoms and shorter disease course - or if it helps boost the effectiveness of Covid-19 vaccines," the authors wrote.
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