The 10 new flu-related deaths in children bring the season's total to 226, the most since 2009-10.
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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Further delays would have cost even more lives, the researchers say.
Overall, total mortality increased 77% in 2020 relative to 2019.
Occupancy decreased for surgical patients when COVID-19 admissions increased, as many surgeries were put on hold.
After infection, anxiety scores were significantly higher, while depressive distress scores were significantly lower.
Pediatric hospital bed occupancy is approaching levels seen last year due to multiple respiratory illnesses.
More than a third of young adults were found to have anxiety or depression during the pandemic, and economic and social uncertainty may have played a role.
No serious adverse events were reported during the prone-position procedure.
Districts can begin ordering tests from the government in early December.
The estimated prevalence of chest pain and abnormal heart rhythms was 10% and 8%, respectively.
The findings, the authors say, support the recommendation of COVID-19 vaccination for all children aged 6 months and older.