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Immunologists call for a study on the role of T cells in protecting people against Covid-19

A recent serological study of 60,000 participants in Spain found that only 10% of the population in areas around Madrid had Covid-19 antibodies, dashing hopes for the worst-hit cities reaching herd immunity as a way out of the pandemic. India’s seroprevalence study in 83 districts found 0.83% of the population had antibodies against the virus.