The results should be interpreted in the context of twice as many hospitalizations for COVID than flu during the study period, the authors say.
The loss of activity is equivalent to 15% of the US population becoming completely immobile for 1 day.
Adult COVID-19 patients also infected with the flu are 4 times more likely to need mechanical ventilation and 2.4 times more likely to die.
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Pediatric hospital bed occupancy is approaching levels seen last year due to multiple respiratory illnesses.
In its weekly update, the CDC also said five new flu-related deaths in children have been confirmed.
Regions on the rise include parts of Asia, North America, and Europe.
Chinese officials told the WHO that the increase in respiratory illness in children is linked to increased circulation of Mycoplasma pneumoniae and an uptick in flu, RSV, and adenovirus.
The highest flu positivity rates were in the Mountain, south central, southeast, and West Coast regions.
Media reports describe overwhelmed children's hospitals in multiple locations in China.
Yet more people said they likely won't receive the COVID-19 booster than said they would get it (44% vs 40%).
Hospitalizations, also on the rise, are highest in seniors and young children.
Most flu viruses were influenza A, and of subtyped samples, about two-thirds were H3N2.
Hospitalizations are also up, especially in seniors and young children.