October 21, 2026- Walgreens launched the 2026-2027 Walgreens Flu Index, an interactive online tool that tracks flu, COVID-19 and other acute respiratory illness activity nationwide. Updated weekly on Mondays, the Flu Index provides state- and county-level insights using multiple sources, including Walgreens flu and COVID-19 testing data, prescription antivirals and over-the-counter cold and flu purchasing trends. This year’s early data suggests flu season is already underway, sooner than in recent years. Nationally, flu activity is tracking approximately four weeks ahead of recent flu seasons, with cases increasing across many western states and Florida.