The United States is using three-strain flu vaccines with the same components as those used in Southern Hemisphere vaccines.
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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The results may guide choice of medications and aid surveillance efforts, the authors say.
COVID test positivity, emergency department visits, hospitalizations, and deaths are are on the rise, but remain at low levels.
The Netherlands had the most detections.
Heating the milk to 63°C (145°F) for at least 30 minutes and 72°C (162°F) for 15 seconds both inactivated all tested viruses.
Chicago, after recording 64 measles cases and administering more than 30,000 vaccine doses, has passed 2 incubation periods with no new infections.
On average, COVID-19 was tied to 2 more days of sick time than influenza.
Recent healthcare system advancements such as higher vaccination uptake and public health interventions likely contributed to the decline, the authors say.
Some of the steps include reinforcing proper hand hygiene and respiratory etiquette, improving building ventilation, cleaning and sanitation when appropriate, and promoting vaccination.
The results should be interpreted in the context of twice as many hospitalizations for COVID than flu during the study period, the authors say.
Almost all index patients (98%) had influenza A infection.
