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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As the holidays approach, the flu surge continues, and tracking shows a fresh spike in COVID-19 markers.
Amid rising flu activity causing decade-high hospitalization rates, COVID-19 markers are also climbing.
As hospitalizations almost double, most states are experiencing high or very high flu levels.
Global flu activity rose in the first half of November, mainly due to rising levels in North America and parts of Europe.
Flu activity is very high or high across most of the continental United States.
The early flu surge is adding to pressure on health systems as they face other respiratory diseases like RSV.
In some nations in the Americas, 3 viral diseases are straining hospitals.
Flu activity in the Northern Hemisphere is rising, with levels up sharply over the past few weeks in North America, the World Health Organization (WHO) said yesterday in its latest global flu update, which roughly covers the last half of October.
A flu surges comes as RSV continues to overwhelm pediatric hospitals in some states.
Muliple respiratory viruses are already straining health systems, with children among the hardest hit groups.