Covid Patients Show Key Immunity Gauge After Six Months in Study
A medic administers a Covid-19 swab test on a patient in a pop-up testing tent in Paris, France. (Photographer: Nathan Laine/Bloomberg)

Covid Patients Show Key Immunity Gauge After Six Months in Study

(Bloomberg) -- A crucial type of defensive blood cell persists for at least six months in people after Covid-19, even in those who had no symptoms, in a new study that may ease concern about waning...
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