Recent increases in the over-all incidence of poliomyelitis have prompted early diagnosis and hospitalization in suspected cases. This has led to the detection of a greater number of the so-called nonparalytic cases. With the advent of passive immunization with gamma globulin, as developed by Hammon and co-workers,1 an even greater percentage of abortive and nonparalytic cases may be anticipated.
Nonparalytic poliomyelitis, as interpreted in this study, refers to cases diagnosed by clinical and laboratory findings in which the patients, at the time of discharge from the hospital, showed no evidence of muscular weakness. During routine follow-up examination of these patients in the outpatient department of Grasslands Hospital, a surprising number showed various sequelae. As a result of these casual findings, we were prompted to carry out a formal study of a large group of patients who were discharged from the hospital during the period 1947 to 1951 and who showed