The epidemic of this variant, also known as B.1.617.2, is still low in the United States, but HHS reports that the epidemic has doubled since last week, rising from 3% to 6%.
In India, the virus exploded in April and May, health Not just the crisis England, Delta Variant is currently the predominant strain. “I can’t forgive it in the United States,” Fauci said. Speaking at a press conference on Tuesday..
“Let’s get vaccinated,” he added. “Be sure to get the second vaccination, especially if you got the first vaccination, and if you haven’t been vaccinated yet, get the vaccination.”
As of Thursday, 52% of Americans have been vaccinated at least once and 43% have been fully vaccinated. According to the Centers for Disease Control and Prevention..
Experts agree that vaccination is the best defense against all epidemic versions of the virus, but there are still many open issues with the Delta variant. Here’s what we know so far:
Are Delta variants more susceptible to transmission than the original version of the virus?
Most likely, some virologists say they need more information to ensure.
who Classify delta variants As a “variant of concern”, it means that it may be associated with increased transmission rates.
UK health officials went a step further and released a risk assessment in early June, showing that delta mutants are more likely to spread from person to person than alpha mutants. Variants have taken over. According to the evaluation, “Delta is likely to be much more contagious than Alpha.”
Dr. Ashish Jha, Dean of the Faculty of Public Health, Brown University, Interview with David Muir of ABC News On Wednesday, he called the Delta subspecies “the most contagious subspecies I’ve ever seen.”
Vincent Racaniello, a professor of microbiology and immunology at Columbia University, argued that the infectivity of delta variants needs to be carefully interpreted. The rapid increase in variants is also associated with human behavior and relaxed restrictions and is not strictly due to the high transmission of the virus.
“Preliminary results show that this increased transmission, but more information needs to be gathered,” said Nemain Clogan, a molecular biologist at the University of California, San Francisco. Clogan explained that most of the species data is in India, but India does not track subspecies as closely as Britain.
“We need molecular data as well as follow-up and epidemiological data,” Clogan said. “The more we understand this virus and how it mutates, the better we will get in the future.”
Clogan and his team are working to make that happen.Monday, the team Posted their research online About the alpha version. Their study, which has not yet been published in scientific journals, suggests that when the alpha variant enters the cell, it suppresses the immune response compared to other variants. This explains why the alpha variant has spread so rapidly. Currently, Crogan’s team is testing the delta variant to see if there is a similar immune response suppression.
“We’re talking while actually doing these experiments,” he said. “I will do my best for all these variations.”
Is the vaccine effective against delta variants?
Yes, it is important for people who have been vaccinated with Pfizer or Moderna to complete two doses.
Ah A study conducted by the British government Analysis of more than 12,000 COVID cases in April and May revealed Pfizer and AstraZeneca vaccines Highly effective The efficacy against the delta variant was lower for the delta variant than for the alpha variant of the virus, but it was valid for the delta variant. According to this study, the Pfizer vaccine was 88% effective against symptomatic disease 2 weeks after the second dose, and the AstraZeneca vaccine was 60% effective 2 weeks after the second dose. It was. The study was conducted in the United Kingdom and does not include the Johnson & Johnson one-shot vaccine.
“For those who have been properly vaccinated, there seems to be no problem,” Clogan said.
But for those who received the vaccine only once, it was “significantly less effective.” Study authors noteBoth the Pfizer and AstraZeneca vaccines were approximately 33% effective against the delta variant in a single dose.
“One dose is not enough to prevent it,” Fauci said on Tuesday, emphasizing the importance of a second dose of the two-dose vaccine.
Regarding the mechanisms that promote double-dose protection, Racaniello believes that the world is paying too much attention to peplomer mutations and antibody responses and not paying enough attention to T cells. Another part of the immune system It also protects the body from infection. “I don’t care if I have alpha, beta, gamma, or delta. Those T cells can still prevent serious illness, and they are made by vaccination,” he said. Told.
According to experts, vaccination is also the key to preventing the virus from circulating and the emergence of more variants. The longer it takes the country and the world to vaccinate, the more likely it is that the virus will mutate.
“In the future, we plan to address these other variants that may or may not be controlled by the vaccine,” Clogan warned. In his view, it’s not time to be content with the status quo. “We need to get everyone vaccinated, but we need to understand how these viruses mutate and overcome our defense mechanisms,” he said. “The virus has always been a few steps ahead of us. We must be ahead of it.”
ABC News’ Ivan Pereira, Brian Hartman, Eric Strauss, Sony Salzman, Arielle Mitropoulos, John Brownstein and Nadine Shubailat contributed to this report.
Copyright © 2021 ABC News Internet Ventures.
Delta Variant: What You Need to Know About the First COVID Strain Detected in India
Source link Delta Variant: What You Need to Know About the First COVID Strain Detected in India