Brian J. Boyarsky, MD, PhD1William A. Werbel, MD2Robin K. Avery, MD2Aaron A. R. Tobian, MD, PhD3Allan B. Massie, PhD1Dorry L. Segev, MD, PhD1Jacqueline M. Garonzik-Wang, MD, PhD1 collaborated on the sequel to their highly acclaimed original paper, “Immunogenicity of a Single Dose of SARS-CoV-2 Messenger RNA Vaccine in Solid Organ Transplant Recipients.”