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 researchers say placentas of pregnant women infected with SARS-CoV-2 should be examined after testing positive.
Vaccine advisers will vote on whether to simplify vaccine composition and will discuss an annual recommendation and a system for vaccine strain selection.
Those least likely to receive at least 4 doses were Black, previously had COVID-19, or were on high-dose corticosteroids.
Moderate to severe COVID-19 from the Omicron variant was nearly three times more likely in women who received no vaccines during pregnancy.
A randomized trial found that antibiotics used to treat Heliobacter pylori infections had lower-than-accepted eradication rates in patients previously treated for COVID-19.
Also, separate reports from the WHO and Europe show declines in cases, with countries and regions reflecting differences in subvariant proportions.
All samples from the Heathrow and Bristol airports and 85% from the Edinburgh terminals tested positive for SARS-CoV-2 genetic material.
The most-cited reasons for not getting new COVID-19 boosters were lack of awareness about eligibility and overestimations of their own existing immunity.
The authors say the findings indicate that the protection conferred by previous infection should not detract from the need for vaccination.
Risk factors for persistent symptoms at 28 days included being unvaccinated at infection, moderate or severe acute illness, longer hospital stays, and underlying health conditions.
