“…The effectiveness of these methods has broadened our ideas about the way the virus is distributed in familial (5,6), institutional (7), and community (8,9) outbreaks of poliomyelitis. The evidence adduced has indicated that the virus can be found in human stools under specified conditions, viz., in paralytic, abortive, and ambulatory convalescent cases of poliomyelitis, and in presumably healthy contacts, during epidemic periods.…”