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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In other COVID developments, federal officials cleared two more rapid tests for emergency use as the weekly case average soared higher.
The adverse effects findings were similar to what preauthorization trials found for younger kids, and the real-world study in adolescents found substantial protection.
In other developments, countries affected earlier by Omicron reported more record cases, as Israel announced fourth doses for higher risk groups.
As officials brace for more post-holiday spread, studies yield promise for boosters and immune system response.
The incubation period for the Omicron variant may be shorter than for Delta and the original SARS-CoV-2 virus, Nebraska researchers reported yesterday, based on an analysis of the first known Omicron cluster in the United States. The team reported its findings yesterday in an early online edition of Morbidity and Mortality Weekly Report (MMWR).
Researchers warn the findings could complicate future COVID-19 mitigation and control plans.
The new guidance comes at a turbulent time with surging case numbers, unmet testing demand, and uncertainties about Omicron.
Full vaccination against COVID-19 was associated with reduced risk of breakthrough infection, but risk of breakthrough infection was much higher among fully vaccinated people with immune dysfunction than those without, US researchers reported today in JAMA Internal Medicine.
The pandemic also widened pre-existing racial and ethnic disparities in non-COVID hospitalizations among Medicare patients.
Some states report massive case increases, leading to work disruptions, flight cancellations, and overrun testing capacity.
