Current US hot spots are Utah, Arizona, and South Carolina.
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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In a phase 3 trial, participants who received the shot were 29% less likely to be diagnosed with flu than those who received a conventional flu shot.
Early data from the UK and Japan show that the H3N2 subclade K was represented in 90% of flu samples.
The authors noted that viral infections trigger the immune system to release substances that lead to inflammation and increase the risk of blood clots.
Flights from Asia played a larger role in disease spread than those from other countries, the study found.
Overall flu cases are 10.8% higher than last year across Australia.
Japan typically reports increased influenza activity at the end of November.
HEPA purifiers were associated with a 33% decrease in viral diversity, but the reduction wasn't linked to fewer school absences.
But there is 'substantial opportunity' for load-balancing strategies during future pediatric hospital surges to reduce bed strain and harm, the authors say.
The money will fund work on CD388, a non-vaccine preventive for both pandemic and seasonal flu.
In other developments, the CDC reported one more pediatric flu death, raising the season's total to 281, the highest for a nonpandemic year.
