Portland and Eugene somehow escaped a nasty flu season, according to Walgreens Flu Index.

Eugene was No. 1 on the index’s list of cities with the least amount of people sick with the flu from November 2015 to April 2016, the time covered by the index. Portland ranked No. 5 on the same list.

The Walgreens Flu Index is compiled using retail prescription data for antiviral medications used to treat influenza across Walgreens locations nationwide.

According to the index, states with the highest rates of influenza were Arizona, Texas, Kentucky, Mississippi and Tennessee. El Paso, Texas, was the top city with flu activity.

Cities with the least amount of flu activity, according to the index, were (after Eugene), Pittsburgh; Toledo, Ohio; Albany-Schenectady-Troy, N.Y.; Portland;

Rochester, N.Y.; Augusta, Ga.- Aiken, S.C.; Boston; Cleveland-Akron, Ohio; and Bakersfield.

Walgreens has 8,173 drugstores in 50 states, the District of Columbia, Puerto Rico and the U.S. Virgin Islands.