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Cumulative 6.4 Million Adult COVID-19 Infections Were Estimated In India By Early May: ICMR Sero-survey

Sero-survey conducted by the Indian Council of Medical Research found high seropositivity in the age-group of 18-45 years (43.3) and the lowest was detected in those aged above 60 (17.2)

Cumulative 6.4 Million Adult COVID-19 Infections Were Estimated In India By Early May: ICMR Sero-survey
Highlights
  • ICMR sero-survey indicated a sero-prevalence of less than 1% in India
  • The findings denote the COVID-19 situation in India in mid-May
  • Sero-survey was conducted in 700 villages selected from 70 districts

New Delhi: The findings of the first national population-based sero-survey indicated that 0.73 per cent of adults in India were exposed to SARS-CoV-2 infection, amounting to 6.4 million infections in total by the early May 2020, revealed the Indian Council of Medical Research (ICMR) sero-survey. Based on the overall adjusted sero-prevalence of 0.73 per cent and reported number of COVID-19 cases, it was estimated that for every RT-PCR confirmed case of COVID-19, there were 82-130 infections in India, noted the survey.

Also Read: ‘Healthcare System In Rural India Is A Cause Of Concern,’ Says Public Healthcare Expert Amid COVID-19 Pandemic

The findings were published in the latest issue of the Indian Journal of Medical Research which noted that the sero-survey was a randomly sampled, community-based survey performed in 700 villages/wards, selected from the 70 districts of the 21 states which were categorised into four strata based on the incidence of reported COVID-19 cases, i.e., zero cases 15 districts; low cases 22 districts; medium cases 16 districts; and high cases 17 districts.

The sero-prevalence ranged between 0.62 and 1.03 per cent across the four strata of districts.

Also Read: Convalescent Plasma Therapy Cannot Be Given To Everyone, May Be Useful In Early Stage Of COVID-19: AIIMS Director

A total of 30,283 households were visited and a total of 28,000 individuals consented to participate. Nearly half (48.5 per cent) of the survey participants were aged between 18 and 45 years and 51.5 per cent (14,390) were female.

Of the 28,000 individuals initially tested by COVID Kavach ELISA, 256 were classified as positive and 69 as indeterminate.

Males living in urban slums and occupation with a high risk of exposure to potentially infected persons were associated with seropositivity, it said.

The seropositivity was highest in the age-group of 18-45 years (43.3), followed by those between 46-60 years (39.5 ) and the lowest seropositivity was detected in those aged above 60 (17.2).

Also Read: Retest All COVID-19 Symptomatic Negative Cases Of Rapid Antigen Test Using RT-PCR Test: Centre

The level of seropositivity to SARS-CoV-2 detected in the stratum of districts with zero cases could be due to the under-detection of COVID-19 cases in the zero stratum districts on account of low testing as well as poor access to the testing laboratories.

The present findings of seropositivity in the strata of districts with zero to the low incidence of COVID-19 cases underscore the need to strengthen surveillance and augment the testing of suspected cases in these areas.

In conclusion, the findings of the serosurvey indicated that the overall sero-prevalence in India was low with less than one percent of the adult population exposed to SARS-CoV-2 infection in India in mid-May 2020. As most of the population remains susceptible to infection, our public health strategy needs to plan for an inevitable increase in transmission.

It is further recommended to establish the district-level facility-based sentinel sero-surveillance to systematically monitor the trend of infection in the long term to inform local decision-making at the lowest administrative unit of public health response towards the COVID-19 epidemic in the country.

Also Read: Convalescent Plasma Therapy Didn’t Help In Reducing COVID-19 Deaths: ICMR Study

(Except for the headline, this story has not been edited by NDTV staff and is published from a syndicated feed.) 

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