From the Division of Clinical Research (H.C.L.) and Office of the Director (A.S.F.), National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD.
Disclosure forms provided by the authors are available with the full text of this editorial at NEJM.org.
A preliminary version of this editorial was published on July 17, 2020, at NEJM.org.