In a flu pandemic setting, the drug could be used to curb household transmission, especially early in the response, 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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Some downward trends might reflect changes in holiday-related health seeking behaviors.
Influenza A currently makes up the majority of global detections, with H3N2 most common among subtyped samples.
Though COVID wastewater and test positivity are higher than last year at this time, medical encounters are trending lower.
Relative to flu patients, those infected with Omicron BA.5 had higher rates of vasopressor use, renal replacement therapy, and in-hospital death.
Flu and COVID indicators continued upward trends, with different regions reporting the most intensive activity.
Emergency department visits for COVID were highest in infants and older adults.
Levels for three viruses are elevated or rising, as the CDC warned of further impacts and urged stepped-up vaccination.
The COVID-19 group had a higher risk of hospital readmission than the seasonal flu cohort.
Flu levels continue to climb in North America, as well as other locations including China's northern provinces.
As COVID markers show growing momentum, the nation's flu season continues to gain steam.