Texas had the highest influenza incidences for the week ending Dec. 19, topping Walgreens' Flu Index report.
The index is compiled from Walgreens' locations nationwide using weekly retail prescription data for antiviral medications prescribed to treat influenza. The data is then analyzed at state and geographic market levels to measure the impact and change of the antiviral medications on a per-store average basis.
The index excludes markets where Walgreens has fewer than 20 retail locations. It is not intended to illustrate levels or severity of flu activity, but rather to show the areas that are experiencing the highest incidence of flu.
For the period ending Dec. 19, the Dallas-Fort Worth, Texas, area had the highest incidence of flu activity, followed by Harlingen-Weslaco-Brownsville-McAllen, Texas; Paducah, Kentucky-Cape Girardeau, Missouri.-Harrisburg, Illinois; Rockford, Illinois; and Chattanooga, Tennessee.
After Texas, Mississippi, Louisiana, Kentucky and Illinois rounded out the top five states with flu activity, respectively.
The area of Paducah, Kentucky-Cape Girardeau, Missouri-Harrisburg, Illinois, had the highest flu gain in the past week. Overall, Kentucky had the highest gain in flu activity.