Delhi Sero-Prevalence Survey: No antibodies in 30% of recove
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A sero-prevalence survey conducted in the first week of August in Delhi has found that 79 of the 257 people who recovered from COVID-19 did not have antibodies against the virus.

Antibodies against COVID-19 infection were found in 29.1% of people in the August sero-prevalence survey in Delhi. Prevalence of antibodies found in males was 28.3% and in females 32.2 %.

Among the people sampled, who had COVID-19 earlier and recovered but did not show antibodies during the survey might have had contracted the disease several months ago at the early stage of the novel coronavirus infection. So, their antibodies (IgG) might have disappeared, experts said.

On the longevity of antibodies developed in response to COVID-19, Jain on August 20 had said, according to experts these antibodies can last for several months -- say 5-8 months -- but the body also produces T-cells in response to the infection.

These T-cells, also called memory cells, help fight any possible infection again, and so, it is "very rare" that a person who has recovered from COVID-19 will be diagnosed with it again, the health minister had said.

Scientists and experts at Maulana Azad Medical College (MAMC) had led the technical team of the August survey.

Source: https://economictimes.indiatimes.com/news/politics-and-nation/sero-survey-conducted-in-august-finds-no-antibodies-in-30-of-recovered-covid-19-patients/articleshow/78128932.cms
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