The strain known scientifically as “B.1.617”, which was discovered for the first time in India, has become of concern because of its rapid growth, which reached 6 percent for positive samples in the United States and 91 percent for samples from the United Kingdom, according to what was reported by the network.CNN“.
The rapid spread of the delta variant has prompted France and many other countries to impose new restrictions on travelers from the United Kingdom.
The delta variant was the fourth declared by the World Health Organization as a “variable of concern”, after alpha strain first discovered in the United Kingdom (B.1.1.7), beta strain discovered in South Africa (B.1.351) and gamma strain found in Brazil (B.1.351). P1).
And the more the virus spreads, the greater the chances of it mutating and evolving into new variants that could eventually resist current vaccines, threatening to undermine the progress of other countries in containing the epidemic.
Experts now believe that the Delta strain is likely to be more transmissible and contagious between people.
Last week, British Health Secretary Matt Hancock said the Delta strain was “about 40 percent more transmissible” than the previously dominant alpha variant, which was already more transmissible compared to the original strain of the Wuhan virus.
For his part, said Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, speaking at a White House briefing, Tuesday, that studies support the idea that the Delta strain is more susceptible to infection.
“It is now clear that its (delta) transmissibility appears to be greater than the first type,” Fauci said.
While it is classified as more contagious than other strains of coronavirus, early evidence suggests that the delta variant causes an increased risk, according to Public Health England.
According to studies by the British Authority, serial analyzes showed that those with the delta variant were more likely to develop serious illness.
In this context, Fauci said that the alternative “may be associated with an increase in the severity of the disease.”
effect of vaccines
Despite the seriousness of the strain that was first discovered in India, vaccines against COVID-19 have been shown to work against the delta variant even with low efficacy.
A team of researchers at Bionic and the University of Texas Medical Branch reported Thursday that they have found evidence that the Pfizer-Biontech vaccine protects against infection with Delta and other strains.
And researchers in the UK reported last week that most people receiving two doses of the Pfizer-Biontech vaccine were still protected against the new variant, although they said the antibodies appeared to be significantly reduced.
Hancock also said that the research so far indicates that “after two doses of the vaccine, we’re confident you’ll get the same protection you got with the old variant.”
People need to be vaccinated with two doses to be fully protected.
Researchers at the Francis Crick Institute and the National Institute for Health Research (NIHR) at UCLA also said that after a single dose of the vaccine, people were less likely to develop an adequate antibody response to protect against the delta variant, compared to the previously dominant variant.
Early data, published by Public Health England, showed similar results for the two vaccines, AstraZeneca and Moderna, which also appeared to be effective against the delta variant once both doses were given.