India had 6.4 million coronavirus infections by May: ICMR's
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About 6.4 million infections of novel coronavirus were estimated in India by early May, the serosurvey by the Indian Council of Medical Research (ICMR) revealed.

Samples of 28,000 individuals were tested for IgG antibodies using the COVID Kavach ELISA kit. It was found that 64,68,388 adults were infected by early May.

• Seropositivity highest in 18-45 age group

43.3% of those who developed antibodies, were between 18 and 45 years of age. Seropositivity was found to be 39.5% between the ages of 46 and 60.

At 17.2%, seropositivity was lowest among those above 60 years.

• Less than 1% of adult population exposed to virus: ICMR

The survey found that less than 1% of India's adult population was exposed to coronavirus by mid-May, meaning that seroprevalence in the country is quite low.

"The low prevalence observed in most districts indicates that India is in the early phase of the epidemic and the majority of the Indian population is still susceptible to SARS-CoV-2 infection," the report, published late last evening, said.

• Infection more prevalent in rural areas, found ICMR

256 were found to be positive, and results of 69 were unclear. "The pooled adjusted prevalence of SARS-CoV-2 infection was 0.73% at the national level," said ICMR.

70% of people who eventually tested positive belonged to rural areas, 16% were from urban-slum areas, and the rest from urban non-slum areas.

• ICMR found that IFR ranged between 0.18 and 15.04

Infection fatality ratio (IFR), which tells about the proportion of deaths among all infected individuals. It is different than the case fatality ratio as CFR concerns itself with deaths among all confirmed cases.

ICMR concluded that IFR (per 10,000 infections) oscillated between 0.18, for districts with zero cases, and 15.04, for districts having a high number of cases.

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