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Research Letter

Time of Day of Influenza Vaccination and Subsequent Influenza Risk

JAMA Network Open 10.1001/jamanetworkopen.2026.25267

July 24, 2026 at 11:00 AM EDT

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This cross-sectional study examines whether time of day of influenza vaccination is associated with differences in vaccine effectiveness.

Corresponding Author: Anupam B. Jena, MD, PhD, Department of Health Care Policy, Harvard Medical School, 180 Longwood Ave, Boston, MA 02115 (jena@hcp.med.harvard.edu).

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