coronavirus case count has significantly underestimated the number of infected people, according to a national serological survey conducted by Indian Council of Medical Research (ICMR).The study estimated that 6.47 million Indians were infected by the coronavirus by mid-May.That compares with the official tally of 85,856 as on 15 May, indicating that millions of sick people were left undiagnosed and may have unknowingly spread the virus.For every covid case that was detected in May, there were 82-130 infections that went undiagnosed, according to the study published in the Indian Journal of Medical Research.The overall seroprevalence, or the number of people exposed to SARS-CoV-2 by mid-May,was just 0.73% of the Indian adult population, the.