Those who were ill with COVID-19 and had at least 1 underlying condition missed more days of work than those with flu or asymptomatic COVID.
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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The rate also increased with each additional underlying medical condition.
The death-rate ratio of adults aged 70 years and older and children younger than 5 years climbed globally, with the Western Pacific Region experiencing the largest increase.
While influenza B patients had better short-term outcomes, they experienced higher-than-expected rates of hospitalization, ICU admission, and death.
Twelve more pediatric flu deaths were reported, mostly caused by the H1N1 strain, raising the season's total to 98.
The group also recommended two vaccine strains for pandemic preparedness, one for the H5N1 2.3.2.1a clade and another targeting the reemerging H5N6 2.3.4.4h clade.
The study involved 68 US children who died from seasonal flu this season.
The Vaccines and Related Biological Products Advisory Committee was scheduled to meet March 13 to select virus strains for the 2025-26 flu vaccine.
The CDC says it does not anticipate posting any more updates on US respiratory disease activity this season.
Median cumulative state rates ranged from 23 (Alaska) to 249 (New York) per 100,000 people.
The CDC says it's now classifying the flu season as high severity for all age-groups for the first time since the 2017-18 season.
