Scientists have found that the Indian strain of the new type of coronavirus is ready to oust its British version from the United States. The researchers note that it already accounts for more than half of new COVID-19 cases.
The Indian variant of the new type of coronavirus – or delta variant – is called strain B.1.617. Generation line B.1.617 is a variant of the SARS-CoV-2 virus that causes COVID-19. Characteristic mutations are L452R, P681R and E484Q. It contains several nested lines (including B.1.617.1, B.1.617.2 and B.1.617.3), slightly differing from each other in characteristic mutations. It was first spotted in India at the end of November 2020. A few months later, by the spring of 2021, the virus spread rapidly around the world. The delta variant differs from other varieties of SARS-CoV-2 in a set of several previously unheard of mutations. Scientists assume that it is they who are responsible for the special infectiousness of the virus. In addition, it is mutations that make it resistant to antibodies.
American epidemiologists have studied in detail how the Indian strain spreads across the United States. The authors of the work, published on the medRxiv preprint site, examined more than 20,000 coronavirus samples. They were collected in different states of the United States from early April to June 15, 2021.
Scientists have come to the conclusion that to date, the Indian strain has almost ousted the British from the United States. The next step is the Brazilian strain, which is inferior to the delta variant in terms of propagation rate
“The share of infections with the British variant of the coronavirus among new infections in just six weeks fell from 70% in April this year to 42%. It is being replaced by the Indian and Brazilian variations of SARS-CoV-2. Moreover, the former is spreading across the United States much faster than the latter, ”the researchers write.
The researchers also noted significant differences in the rate at which new SARS-CoV-2 variants spread across states with high and low vaccination rates.