Researchers in Shanghai hope to determine whether some recovered coronavirus patients have a higher risk of reinfection after finding surprisingly low levels of Covid-19 antibodies in a number of people discharged from hospital.
All of the patients had recently recovered from mild symptoms of the disease and most of those with low antibody levels were young. The researchers excluded patients who had been admitted to intensive care units because many of them already had antibodies from donated blood plasma. “About 30 per cent of patients failed to develop high titers of neutralising antibodies after Covid-19 infection. However, the disease duration of these patients compared to others was similar," they said.
“This is a clinical observation we made at the front line. What this will mean to herd immunity will require more data from other parts of the world,” Professor Huang Jinghe, the leader of the team, said on Tuesday. The researchers also found that the Covid-19 antibody could bind with a distantly related strain that caused an outbreak of severe acute respiratory syndrome in 2003.
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