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Prevalence of Delta Variant Not Different Between Vaccinated and Unvaccinated Groups: ICMR Study

Delta is the most contagious of all variants known. The original Wuhan strain was overtaken by the more contagious D614G strain by March 2020, and that virus was responsible for the Victorian second wave.

Delta is the most contagious of all variants known. The original Wuhan strain was overtaken by the more contagious D614G strain by March 2020, and that virus was responsible for the Victorian second wave.

Covid-infected persons, both vaccinated and unvaccinated ones, who visited the Greater Chennai Corporation's triage centers between May 3 and 7, were enrolled in the study.

A study by the ICMR on covid-infected individuals in the city has indicated that the prevalence of B.1.617.2 (Delta variant) “was not different between the vaccinated and unvaccinated groups." 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, the study, approved by the ICMR-National Institute of Epidemiology, Chennai, said.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 Corporation’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 Covishield and Covaxin recipients after infection with delta variant. This might be the reason for the breakthrough infections observed in the fully vaccinated individuals," it said.

However, the proportion of patients progressing to severe illness and mortality was lower in the vaccinated groups, it added.While B.1.617.2 has the potential to infect both the vaccinated and unvaccinated individuals, however, the progression of illness seems to be prevented by vaccination. “Therefore, non-pharmaceutical interventions must continue to slow down the transmission. Additionally, the pace and scale of vaccination has to be increased to mitigate the further waves of the pandemic," it said.

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first published:August 18, 2021, 08:23 IST