About The Study: Vaccines administered in autumn and winter 2025 to 2026 showed approximately 55% effectiveness against symptomatic disease among older adults within 2 months of vaccination. The low uptake of vaccines, which showed substantial short-term effectiveness, suggests missed opportunities for preventing symptomatic COVID-19 among unvaccinated vulnerable groups.
Corresponding Author: To contact the corresponding author, Charlotte Laniece Delaunay, PhD, email c.laniece@epiconcept.fr .
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(doi:10.1001/jamanetworkopen.2026.19040)
Editor’s Note: Please see the article for additional information, including other authors, author contributions and affiliations, conflict of interest and financial disclosures, and funding and support.
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