Studies in Ahmedabad in earlier rounds of sero-surveillance showed that up to 30% of the population with past infection, which is not recent, do not show antibodies in such surveys. It is possible that the waning of antibodies and cell-mediated immunity together can indicate that an additional 10-15% of persons might be protected. Therefore, the proportion of people with some immunity protection at the population level in Ahmedabad may be close to 90-95%. (Read More)
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