Ischemic Stroke After Bivalent COVID-19 Vaccination: Self-Controlled Case Series Study.

We found an elevated point estimate for the risk of ischemic stroke within 1-42 days (but not within 1-21 days) after the coadministration of the Pfizer-BioNTech bivalent vaccine and influenza vaccine among individuals younger than 65 years old that did not reach statistical significance, although the sample size was limited.

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