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This week’s Walgreens Flu Index shows that a number of states, including the Carolinas, Tennessee, and Louisiana, continue to see widespread flu activity in the final week of March.

The Walgreens Flu Index is a weekly report developed to provide state- and market-specific information regarding flu activity, and ranking of those experiencing the highest incidences of influenza across the country.

The Walgreens Flu Index is a weekly report developed to provide state- and market-specific information regarding flu activity, and ranking of those experiencing the highest incidences of influenza across the country.