From the University of Pennsylvania, Vaxconsult, Doylestown, Pennsylvania.

Accepted for publication December 18, 2023

The author has no funding or conflicts of interest to disclose.

Address for correspondence: Stanley A. Plotkin, MD, University of Pennsylvania, Vaxconsult, 4650 Wismer Rd., Doylestown, PA 18902. E-mail: [email protected].