DEERFIELD, Ill. — The Harlingen-Weslaco-Brownsville-McAllen, Texas, region is the top demographic market area for influenza activity, followed by Lafayette, La., and Puerto Rico, according to the Walgreens Flu Index for the week of Dec. 25.
On a flu activity gains basis, the same southern Texas region also ranks No. 1, followed by Lincoln and Hastings-Kearney, Neb., and Jackson, Miss., for the week of Dec. 25.
The top states for flu activity gains are Montana, Utah, Nebraska and Oklahoma, respectively.
In terms of states, Puerto Rico has the most overall flu activity, followed by Mississippi, Montana and Oklahoma, respectively.
The Walgreens Flu Index is compiled weekly using weekly retail prescription data for antiviral medications used to treat influenza across Walgreens locations nationwide.