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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The vaccine can be stored for up to 6 months at refrigerator temperatures.
Of Denmark's Omicron patients, 75% were fully vaccinated, and 9% had received a booster shot.
Only 20% and 24% of Pfizer/BioNTech COVID-19 vaccine recipients in a Chinese study had detectable neutralizing antibodies against two isolates of the highly transmissible Omicron (B.1.1.529) variant, while recipients of the Coronavac vaccine had no antibodies against either isolate.
The virus multiplies 70 times faster in the bronchi than Delta and the original SARS-CoV-2, researchers report.
About half of the deaths have occurred in the past year, when vaccines have been available.
One study finds that 2 doses of Moderna were highly effective against all variants, but Delta protection waned.
Researchers updated a Commonwealth Fund study yesterday, and now estimate that COVID-19 vaccination has prevented 1.1 million US deaths and 10.3 million hospitalizations, up from July's figure of 279,000 deaths and 1.25 million hospitalizations prevented.
Even if Omicron causes less severe disease, sheer numbers could overwhelm hospitals.
The pill cut non-Omicron hospitalization or death 89% if taken early in the disease course, company data show.
Those staying in hotel rooms with medical and social support fared better than those in a shelter.
