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Flu clinical trials recruiting in the U.S.

47 studies for Flu are recruiting participants at sites across the United States.

The flu can cause serious illness in people over 65, babies, and people with certain chronic illnesses. The best way to prevent the flu is to get a vaccine.

Cities with the most studies

• Atlanta, GA10 studies
• Washington, DC8 studies
• St. Louis, MO7 studies
• Houston, TX7 studies
• Chicago, IL6 studies
• Charlottesville, VA6 studies
• Hialeah, FL6 studies
• Baltimore, MD6 studies
• Tucson, AZ5 studies
• Overland Park, KS5 studies
• San Diego, CA5 studies
• Miami, FL5 studies
• Durham, NC4 studies
• Seattle, WA4 studies
• Winston-Salem, NC4 studies
• Philadelphia, PA4 studies
• Salt Lake City, UT4 studies
• Richmond, VA3 studies
• Portland, OR3 studies
• Columbus, OH3 studies
• West Palm Beach, FL3 studies
• Deltona, FL3 studies
• Glendale, AZ3 studies
• Dallas, TX3 studies
• Rochester, NY3 studies
• Anniston, AL3 studies
• Tempe, AZ3 studies
• Meridian, ID3 studies
• Spartanburg, SC3 studies
• Torrance, CA3 studies
• Kansas City, MO3 studies
• Pittsburgh, PA3 studies

By state

• Alabama6 studies
• Arizona6 studies
• Arkansas3 studies
• California14 studies
• Colorado4 studies
• Connecticut4 studies
• Florida9 studies
• Georgia11 studies
• Idaho5 studies
• Illinois8 studies
• Indiana4 studies
• Kansas6 studies
• Kentucky3 studies
• Louisiana5 studies
• Maryland12 studies
• Massachusetts3 studies
• Michigan4 studies
• Minnesota4 studies
• Missouri10 studies
• Nevada3 studies
• New York7 studies
• North Carolina6 studies
• Ohio7 studies
• Oklahoma3 studies
• Oregon3 studies
• Pennsylvania9 studies
• South Carolina5 studies
• Tennessee4 studies
• Texas11 studies
• Utah4 studies
• Virginia7 studies
• Washington4 studies

Recently updated studies

From ClinicalTrials.gov, data retrieved Nov 15, 2026. Each study sets its own eligibility; the study team decides who can join.