A study by the Indian Council of Medical Research (ICMR) on covid-infected individuals in the city has suggested that the prevalence of Delta variant  “was not different between the vaccinated and unvaccinated groups. The study, approved by the ICMR-National Institute of Epidemiology, Chennai, said. : " B.1.617.2, or the Delta variant of covid causing Sars Cov2 was the dominant circulating strain and one of the primary drivers for the country’s covid second wave.” Those involved in the study include researchers from the National Institute of Epidemiology, here.

Covid-infected persons, both vaccinated and unvaccinated ones, who visited the Greater Chennai Corp’s triage centers between May 3 and 7, were enrolled in the study."The study findings indicate that the prevalence of B.1.617.2 was not different between the vaccinated and unvaccinated groups.

Delta variant was the dominant circulating strain and one of the primary drivers for the second wave ofRS-CoV-2 in India." “Studies have documented reduction in neutralization titres among Covaxin and Covishield recipients after infection with delta variant. This might be the reason for the breakthrough infections observed in the fully vaccinated individuals," it said.

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