Tom Frieden, former director of the Centers for Disease Control and Prevention, told "Fox News Sunday" that the new surge in coronavirus cases is the result of states lifting their lockdown measures too quickly.

Why it matters: Florida, Arizona, Georgia, South Carolina and Nevada reported new daily coronavirus case records on Saturday, while the country as a whole reported more than 45,000 new cases on June 26 alone, according to Johns Hopkins University data.

What they're saying: "If you open when cases are still increasing, as many states did, it's like leaning into a left hook," Frieden said. "You're going to get hit hard, and that's what's happening."

  • "When we see Arizona, Texas, Florida, South Carolina — they are currently in a rapid upswing. And, sad to say, this is going to continue to get worse for weeks because the physical distancing that they're implementing now will only take effect — you don't see it for another few weeks. So we're going to see a few more weeks of increases, in all likelihood, in several states."
  • "We're going to see increasing spread. That's why the three W's are so important: wear a mask, wash your hands — or use sanitizer — and watch your distance."

The big picture: Frieden said there's a misconception that there's a silver lining in the fact that younger people account for more of the new cases.

  • "Now there's some comfort in the fact that it's younger people, but what starts in the young doesn't stay in the young," Frieden said.
  • Texas, one of the early states to roll back its lockdown measures, is now urging its citizens to stay at home again as cases begin to climb.

Go deeper: CDC expands list of who's most at risk for the coronavirus

Go deeper

Coronavirus cases flat or growing in 48 states

Data: The COVID Tracking Project, state health departments; Map: Andrew Witherspoon, Sara Wise, Naema Ahmed, Danielle Alberti/Axios

The number of coronavirus cases increased in the vast majority of states over the last week, and decreased in only two states plus the District of Columbia.

Why it matters: This is a grim reminder that no part of the United States is safe from the virus. If states fail to contain their outbreaks, they could soon face exponential spread and overwhelmed health systems.

Updated Jun 30, 2020 - Health

Florida is "not going back" on reopening, governor says

Florida Gov. Ron DeSantis at the Miami-Dade Emergency Operations Center on June 8. Photo: Eva Marie Uzcategui/Getty Images

Florida Gov. Ron DeSantis told reporters on Tuesday that the state will not reinstate restrictions or close businesses to mitigate the spread of the novel coronavirus.

Why it matters: More than 50% of coronavirus infections in the U.S. are from states like Florida, Texas, California and Arizona, Axios' Marisa Fernandez reports.

Updated 13 hours ago - Health

U.S. daily coronavirus cases top 50,000 for first time

A medical technologist processes test samples for the coronavirus at a lab in Tampa, Florida, on June 25. Photo: Octavio Jones/Getty Images

The number of people to test positive for the novel coronavirus in the U.S. surpassed 50,000 for the first time ever on Wednesday, Johns Hopkins data shows.

Driving the news: The pandemic is accelerating across the U.S., with the Sun Belt being hit particularly hard. Daily coronavirus case records were reported on Wednesday in Texas (8,076), Arizona (4,878), Georgia (2,946), North Carolina (1,843) and Tennessee (1,806).