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Rio Grande Valley tops Walgreens flu index

The Rio Grande Valley topped the Walgreens Flu Index last week.

The Rio Grande Valley topped the Walgreens Flu Index last week.

The Walgreens Flu Index attempts to track flu activity by monitoring prescription data at 8,000 locations nationwide.

The company's Harlingen-Weslaco-Brownsville-McAllen market, which encompasses the Rio Grande Valley, topped the flu index during the first week, according to a news release from the company.

Cameron County Health Authority Dr. James Castillo said the data doesn't surprise him — and he expects more people to catch the flu during the next few months.

The U.S. Centers for Disease Control and Prevention also tracks flu activity. It reported regional flu activity in Texas and widespread flu activity in seven other states: Arkansas, Georgia, Louisiana, Massachusetts, Mississippi, Oklahoma, and Virginia.

Walgreens cautions that the company's flu index doesn't track levels or severity of flu activity.

"The Index is not intended to illustrate levels or severity of flu activity, but rather, based on this methodology, to show which populations are experiencing the highest incidences of influenza within the U.S. and Puerto Rico each week," according to the news release.

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