Early sharp rises in some South American countries put pressure on healthcare systems.
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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Rather than indoor-outdoor air exchanges per hour, the document describes an "equivalent clean air flow" target per occupant of pathogen-free air.
Patients with COVID-19 also saw a sixfold higher rate of in-hospital deaths.
Flu activity is on the downslope in the Southern Hemisphere, and globally influenza A is dominant with H3N2 and H1N1 proportions nearly equal among subtyped samples.
Having 2 or more underlying medical conditions raised the risk of ICU admission, mechanical ventilation, and in-hospital death.
Of positive flu samples at national labs, 68.5% were influenza, and of subtyped samples, 66.2% were the 2009 H1N1 virus.
The rates the researchers saw could serve as a baseline for gauging whether coinfections rates are shrinking or growing.
A study found that the recombinant influenza vaccine provided better protection against hospitalization than the standard-dose vaccine.
A roundup of infectious disease stories in the news.
Southern Hemisphere flu activity continues to rise in some countries, though levels have stabilized or are declining in others.
In Australia, clinic visits for flu increased, and in South America, flu declined in Chile but rose in Argentina, Paraguay, and Uruguay.