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Flu clinical trials recruiting in the U.S.

39 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, GA9 studies
• Washington, DC7 studies
• Chicago, IL5 studies
• Philadelphia, PA5 studies
• Charlottesville, VA5 studies
• Baltimore, MD4 studies
• Salt Lake City, UT4 studies
• Hialeah, FL4 studies
• Houston, TX4 studies
• Seattle, WA4 studies
• Durham, NC4 studies
• St. Louis, MO4 studies
• Kansas City, MO3 studies
• Rochester, NY3 studies
• Winston-Salem, NC3 studies
• Columbus, OH3 studies
• Portland, OR3 studies
• Miami, FL3 studies
• Torrance, CA3 studies
• San Diego, CA3 studies

By state

• Alabama5 studies
• Arizona3 studies
• Arkansas3 studies
• California10 studies
• Connecticut3 studies
• Florida7 studies
• Georgia10 studies
• Idaho3 studies
• Illinois7 studies
• Kansas3 studies
• Louisiana4 studies
• Maryland9 studies
• Michigan3 studies
• Missouri6 studies
• New York5 studies
• North Carolina5 studies
• Ohio5 studies
• Oregon3 studies
• Pennsylvania8 studies
• South Carolina3 studies
• Tennessee4 studies
• Texas8 studies
• Utah4 studies
• Virginia5 studies
• Washington4 studies

Recently updated studies

From ClinicalTrials.gov, data retrieved Sep 29, 2026. Each study sets its own eligibility; the study team decides who can join.