Think you are protected against the Covid-19 coronavirus and don’t need the Covid-19 vaccine just because you’ve already had Covid-19? Well, contrary to what some motivational talks may tell you, don’t be so sure of yourself. A study just published in the journal Emerging Infectious Disease found that 36% of those who had had Covid-19 didn’t have antibodies against the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) in their blood.
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For the study, a research team, led by first author Weimin Liu, M.D. and senior author Beatrice Hahn, M.D. from the University of Pennsylvania, checked blood samples from 72 people who had tested positive for the Covid-19 coronavirus via RT-PCR tests. All but two of the people had had symptoms, with 13 (18%) having mild disease, 48 (67%) moderate disease, and nine (12%) severe disease. They waited at least three weeks after each person no longer had symptoms before checking their blood.