Authorities in Delhi will undertake a mammoth exercise from today to determine the spread of the coronavirus disease amidst a rising number of cases in the national capital, which is one of the worst...
source https://www.ndtv.com/delhi-news/serological-survey-to-determine-spread-of-covid-19-in-delhi-from-today-2253048
source https://www.ndtv.com/delhi-news/serological-survey-to-determine-spread-of-covid-19-in-delhi-from-today-2253048
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