The findings could help hospitals and public health officials prepare for outbreaks.
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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Levels of RSV also remain high in many areas of the US, while COVID-19 activity is waning in most of the country.
So far this season, the CDC estimates that there have been at least 24 million flu-related illnesses, 310,000 hospitalizations, and 20,000 deaths.
Children with the condition are also more likely to have severe infections, the study suggests.
Flu, respiratory syncytial virus, and COVID-19 levels still elevated in some parts of the country.
Relative to people of healthy weight, those with class 3 obesity were 3 times more likely to be hospitalized for or die of infection.
For the total 2025-26 flu season, 92% of flu specimens have been typed as influenza A.
Eight more children died of influenza this week, bringing the season total to 52.
The highest antibody levels were seen among those who were school-aged children during the 2009 H1N1 flu pandemic.
The authors recommend using portable air purifiers that stir up and clean the air or, in the case of close contact, wearing an N95 respirator.
The CDC estimates 19,000,000 illnesses, 250,000 hospitalizations, and 10,000 deaths due to flu this season.
