DEERFIELD, Ill.–(BUSINESS WIRE)–The Walgreens Flu Index™ is a weekly report developed to provide state- and market-specific information regarding flu activity, and ranks those states and markets experiencing the highest incidences of influenza across the country. Now in its fifth flu season, the Walgreens Flu Index was developed as a tool for consumers, health officials and the media to track flu activity in their area, and it continues to be an indicator of flu activity and important reminde

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