55 million people worldwide have acquired SARS-CoV-2, the virus that causes COVID-19.However, confirmed cases of people reacquiring the infection remain extremely rare.
This is despite evidence that the number of antibodies against the virus in the blood of most people steeply declines after they contract a mild or asymptomatic infection.The new research suggests that people reacquiring the infection may be rare because helper T cells, a type of immune cell, continue to protect most people against the virus for at least 6 months.Stay informed with live updates on the current COVID-19 outbreak and visit our coronavirus hub for more advice on prevention and treatment.When they recognize a virus, helper T cells recruit other immune cells to.
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