Abstract
A viral agent was isolated in primary rhesus monkey kidney cell cultures from rectal swabs obtained from 2 healthy children resident in Western Pennsylvania. Although the agent had many of the characteristics of the human enterovirus group no serological relationships to any of the recognized protypes was demonstrated. Sera drawn from 2 normal adult population groups showed the presence of antibodies in a significant proportion (16-18%) against the virus which was successfully reisolated from the 2 original specimens. The evidence sugests that this as yet unidentified agent is a member of the human enterovirus group.