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FDA Center for Devices & Radiological Health Issues Warning Letter to Longhorn Vaccines & Diagnostics
March 25, 2026
WASHINGTON, March 25 -- The U.S. Department of Health and Human Services Food and Drug Administration issued the following warning letter to Longhorn Vaccines and Diagnostics LLC from its Center for Devices and Radiological Health:

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Recipient: Jeffrey D. Fischer, President, Longhorn Vaccines and Diagnostics LLC, 7272 Wisconsin Avenue, Ste 900, Bethesda, MD 20814, United States, jeff@lhnvd.com

Issuing Office: Center for Devices and Radiological Health, . . .

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