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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New data suggest that severe pneumonia in mechanically ventilated COVID-19 patients is similar to other types of pneumonia, but COVID patients require mechanical ventilation longer.
In eight countries, vaccine hesitancy increased, and nearly 1 in 8 of all respondents, particularly those aged 18 to 29 years, said they were hesitant to receive a booster dose.
In other developments, the WHO has more talks scheduled with China and will soon update its variant assessments.
The team from South Korea also found high protection against critical illness.
In other global developments, Japan's COVID deaths are at daily record highs, and India shed light on its subvariant picture.
Data reveal no link between COVID-19 vaccination or infection of pregnant women and major congenital anomalies in their babies.
After accounting for the drop in in-person services and the rise in telehealth services, the overall use of mental health services rose during the pandemic for three diagnoses.
The CDC fine tuned its projection for XBB.1.5, which is still spreading quickly, mainly in the northeast.
Among MIS-C patients, 8% had complications affecting 6 or more of the 8 studied organs.
One study looked at BA.5 infection after vaccination, while another examined vaccine effectiveness in children and adolescents.
