Key points are not available for this paper at this time.
From the Division of Infectious Diseases, Boston City Hospital, Boston University School of Medicine, Boston, Massachusetts 1 Chief of Infectious Diseases and Medical Microbiology, Instituto Nacional de Cardiologia, Mexico 22, DF 2 Director, Maxwell Finland Laboratory for Infectious Diseases, Boston City Hospital Professor of Medicine & Microbiology, Director of Infectious Diseases, Boston University School of Medicine, Boston, Massachusetts.
Álvarez et al. (Sun,) studied this question.