In areas with low COVID-19 vaccination, the United States will witness a surge in cases of Delta variant of coronavirus, US’s top infectious disease expert, Anthony Fauci said on Sunday.

This comes after the Joe Biden administration hailed the success of America’s vaccination campaign and said that 66.8% of US adults have received at least a single dose of COVID vaccine by July while 54.6% of all residents have received one or more shots.

Joe Biden’s chief medical adviser, Anthony Fauci talked about the concern of reopening of businesses and societies could cause a spike, he told NBC in an interview, “I don’t think you’re going to be seeing anything nationwide, because fortunately, we have a substantial proportion of the population vaccinated. So it’s going to be regional.”

The Delta COVID variant, first detected in India last year, is highly transmissible and now is in at least 98 nations and has become a global concern. WHO director-general on Saturday waned that the vaccine availability globally is being “outpaced by variants.”

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Anthony Fauci told NBC that as Delta cases would rise in the US, Americans are soon going to find themselves in a “confusing” situation.

“We’re going to see … almost two types of America,” he said. The health expert further explained that there are some regions of America that are highly vaccinated and have a low level of “dynamics of infection.”

He added, “And in some places, some states, some cities, some areas, where the level of vaccination is low and the level of virus dissemination is high – that’s where you’re going to see the spikes.”

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On Friday, US President Joe Biden addressed concerns related to the surge of Delta variant and said, “I am concerned that people who have not gotten vaccinated have the capacity to catch the variant and spread the variant to other people who haven’t been vaccinated.”

“I’m not concerned there’s going to be a major outbreak … another epidemic nationwide. But I am concerned lives will be lost,” he said.