1. From the University of Rochester Medical Center, Rochester (E.E.W., A.R.F.), and Vaccine Research and Development (E.D., G.C.V., M.I., D.E., T.M., R.N.S., K.S., D.C., K.K., K.U.J., K.A.S., A.G., W.C.G.) and Worldwide Research, Development, and Medical (A.S.A.), Pfizer, Pearl River — both in New York; iTrials–Hospital Militar Central (G.P.M.), Fundación INFANT (F.P.P.), and Fundación Respirar Clinical Research Unit (P.A.D.), Buenos Aires, and Clinica Mayo de Urgencias Médicas Cruz Blanca, San Miguel de...