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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Within the first 21 days after diagnosis, the risk of all-cause death was 68 to 81 times higher in COVID-19 patients.
Poor outcomes include illness and death, bacterial infections, more ICU days, and serious conditions such as preeclampsia.
The number of affected COVID-19 survivors is based on the estimated global rate of 10% of infected people and more than 651 million documented cases and is likely an undercount.
The WHO welcomed the new details, but asked for a breakdown by province and more SARS-CoV-2 sequences.
Follow-up investigations in the US and other nations and by the company have not found the same increase.
ICU care for COVID-19 patients averaged $24,200, compared with $4,700 for general-admission patients.
Compared with uninfected pregnant women, the risk of death was more than 7 times higher, and the risk of ICU care was almost quadruple.
US COVID trends show mixed patterns, with cases and hospitalizations down a bit, but deaths up sharply.
The median time to sustained recovery (at least 3 consecutive symptom-free days) was 12 days in the fluvoxamine group and 13 days in placebo recipients.
New data suggest that transfusion of COVID-19 convalescent plasma improves survival in hospitalized, infected patients who have impaired immune systems.
