The United States has been in a "protracted health crisis" for decades, the researchers say.
Plaque growth can lead to a higher risk of heart attack, stroke, and other life-threatening cardiovascular events for as long as 1 year.
Post-exertional malaise, or exercise intolerance, was seen in 36% of those with long COVID.
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The new cases are in California, Oregon, and Washington state.
As concerns deepen about Iran, the WHO is in the process of sending a mission to the country, with UAE help.
Four health workers who met the criteria for hospital release had positive PCR results 5 to 13 days later.
The CDC has broadened how it determines persons under investigation.
Outside of China, hot spots include South Korea, Italy, and Iran.
In addition, Vice President Pence appoints AIDS expert Deborah Birx, MD, to coordinate the federal response.
Pence, who will lead a response task force, says he will reach out to governors.
For the first time, new cases outside of China exceed new cases reported within China.
"Not a question of if, but when, and of how many ... will have severe illnesses."
In Europe, Austria, Croatia, and Switzerland reported their first cases, with links to Italy, as Middle East countries reported more cases, fueled by Iran's outbreak.
