Overall, 57% of participants had evidence on PET/MRI of inflammation affecting the heart or lungs.
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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A review by members of the National Institutes of Health COVID-19 Treatment Guidelines Panel finds insufficient data to recommend for or against convalescent plasma for treating COVID-19.
The researchers calculate that about 9.3% of the population had been infected by July.
On the international front, Europe continues to see case counts rise, and the WHO makes its case for big investments in tools to battle the virus.
Of 4 new studies, all but 1 suggest that minorities shoulder heavier burdens.
Today's Morbidity and Mortality Weekly Report (MMWR) provides updated information from voluntary reports on 100,570 healthcare personnel (HCP) with COVID-19 from February to July that shows variations in risk, including higher death rates in minority workers.
"What we can change is where we are in October, and into the winter," Canadian PM Justin Trudeau says.
A large study of German patients presented online at this week's European Society of Clinical Microbiology and Infectious Diseases (ESCMID) Conference on Coronavirus Disease found that men have a 62% higher risk of death from COVID-19, possibly due to higher levels of inflammation.
In one study, 25.5% of patients had low viral loads in April, but the rate climbed to 70% in June.
"To sustain these gains, we must continue our disciplined mitigation efforts."
The WHO calls on nations to counter misinformation about COVID-19.