Walgreens has released its annual flu index, which maps the incidence of infection based on prescription fills for antiviral medications. 

“While flu activity remains relatively low across most of the U.S., our data suggests a gradual increase in incidences of flu in a growing number of markets,” said Richard Ashworth, Walgreens president of pharmacy and retail operations. “Even with a slower start to flu season, the Flu Index helps health officials, media and consumers stay informed about the flu in their local community.”

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