Research Letter

Trends in County-Level Childhood Vaccination Exemptions in the US

JAMA 10.1001/jama.2025.24407

January 14, 2026 at 11:00 AM EST

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This study examines US county-level trends in nonmedical and medical exemptions to childhood vaccination requirements.

Corresponding Author: Nathan C. Lo, MD, PhD, Division of Infectious Diseases and Geographic Medicine, Stanford University, 300 Pasteur Dr, Lane Building L134, Stanford, CA 94304 (Nathan.Lo@stanford.edu).

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