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Monday, Aug 04, 2025

Delta Variant "Greatest Threat" To US' Covid Efforts: Dr Anthony Fauci

Delta Variant "Greatest Threat" To US' Covid Efforts: Dr Anthony Fauci

The variant, which was first detected in India, is more contagious and causes more severe disease than other circulating variants, Dr Anthony Fauci said.
The highly contagious Delta variant of the coronavirus is the "greatest threat" to America's attempt to eradicate the Covid pandemic, the country's leading infectious disease expert and White House Chief Medical Advisor Dr Anthony Fauci has warned.

The variant, which was first detected in India, is more contagious and causes more severe disease than other circulating variants, he said on Tuesday during a White House Covid-19 response team briefing.

Fauci said the Delta variant now makes up more than 20 percent of all new cases in the US, nearly doubling from nearly 10 percent two weeks ago.

"Similar to the situation in the UK, the Delta variant is currently the greatest threat in the US to our attempt to eliminate COVID-19," Fauci told reporters during a virtual news conference.

However, the "good news" is that the US vaccines are effective against the Delta variant, said Dr Fauci, the head of the National Institutes of Allergy and Infectious Diseases (NIAID).

"Conclusion, we have the tools, so let's use them and crush the outbreak," he asserted.

The US Centers for Disease Control and Prevention deemed Delta a "variant of concern" last week.

The Delta variant recently became the dominant strain in the UK, surpassing the Alpha variant first discovered in the country. The strain makes up more than 90 percent of new cases and delayed the UK's scheduled reopening.

The transmissibility of the Delta variant is unquestionably greater than the wild type SARS-CoV2 as well as the Alpha variant, Fauci said, adding that it is associated with increased disease severity as reflected by hospitalisation risk compared to the Alpha variant.

The Imperial College of London did a study in over 100,000 homes and found that youth were driving the UK's surge with a five-fold higher positivity among children aged 5-12 and young adults 18-24 years versus people older than 65 years old, he said.

"Look at what is happening in the United States. We have seen, as was the case with B.1.1.7, we seem to be following the pattern with the Delta variant with a doubling time of about two weeks if you look from May 8 with 1.2 to 2.7 to 9.9 and as of a couple of days ago 20.6 percent of the isolates are Delta," Dr Fauci said.

He said the United States has tools to address the challenge.

"The effectiveness of the vaccines, in this case, two weeks after the second dose of Pfizer BioNTech with 88 percent effective against the Delta and 93 percent effective against the Alpha when you are dealing with symptomatic disease," he said.

Rochelle Paula Walensky, the director of the Centers for Disease Control and Prevention, said that CDC continues to follow the prevalence of the Delta variant of COVID-19.

In the last two weeks, the prevalence of cases resulting from the Delta variant has doubled to just over 20 percent. This variant represents nearly half of all infections, she said.

"This is concerning but expected knowing what we do about how efficiently this variant spreads and by what we saw in the United Kingdom with this variant.

"We know our vaccines work against this variant; however, this variant represents a set of mutations that could lead to future mutations that evade our vaccine, and that is why it is more important than ever to get vaccinated now to stop the chain of infection, the chain of mutations that could lead to a more dangerous variant," Walensky said.

The USCDC has classified the Delta as a "variant of concern."

"The B.1.1.7 (Alpha), B.1.351 (Beta), P.1 (Gamma), B.1.427 (Epsilon), B.1.429 (Epsilon), and B.1.617.2 (Delta) variants circulating in the United States are classified as variants of concern. To date, no variants of high consequence have been identified in the United States," the CDC said in a statement last week.

The World Health Organization classified the Delta variant as a variant of concern on May 10.

"This is the most transmissible of all the variants that we've seen," Dr Peter Hotez, dean of the National School of Tropical Medicine at Baylor College of Medicine, told CNN on Monday.

"We saw what happened in the UK, where it overtook the entire nation. So I'm worried that's going to happen in the US," he said.

Faced with a more transmissible variant, "it looks like we do see a resurgence late in the summer, or in the early fall," said Justin Lessler, an epidemiologist with the Johns Hopkins Bloomberg School of Public Health.

The most recent model finds that a Delta-like variant that's assumed to be 60 percent more transmissible than Alpha, coupled with 75 percent of eligible Americans getting vaccinated, can result in Covid-19 bouncing back from summer lows to cause more than 3,000 deaths per week at various points during the fall and winter.

That's about 1,000 more COVID-19 deaths than the US has seen over the past week, though still far below the peak of 24,000 deaths during the second week of January.

The US is the worst-hit nation due to the pandemic. The country has reported more than 33,566,000 confirmed cases and reported over 602,400 deaths, according to Johns Hopkins University COVID-19 tracker.
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