Test positivity topped 30%, with steady rises in emergency department visits and hospitalizations.
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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CDC wastewater tracking shows SARS-CoV-2 detections are now at the low level nationally.
The test joins other over-the-counter COVID-19/flu tests already available under emergency use authorization.
The United States is using three-strain flu vaccines with the same components as those used in Southern Hemisphere vaccines.
Though KP.3.1.1 variant levels continue to rise, the proportion of XEC viruses is also trending upward.
Wastewater levels for COVID-19 remain high but are low for RSV and influenza.
Among adults for whom RSV vaccines are recommended, 21% say they will definitely get vaccinated this upcoming season.
For all children in the study, advanced maternal age, gestational high blood pressure, cesarean delivery, and being a boy were associated with increased risk of seizures.
In total, 75% of survey respondents strongly or somewhat supported public health wastewater monitoring for infectious diseases.
Most of the kids who died were unvaccinated, and about half had no underlying health conditions.
Decisions about investing in building wastewater surveillance capacity should consider the vast economic and social cost of responding to infectious diseases not detected and arrested early, the authors say.