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Echo Virus Type 7 Infections in a Continuously Observed Population Group in Southern Louisiana^*

Wolf W. Henigst, Henry M. Gelfand, Dorothy R. LeBlanc AND John P. Fox

During a study of the natural occurrence of poliovirus infections in southern Louisiana, 115 families were kept under continuous observation during the 3 years, 1954–1956. In this period 207 isolations of E7 virus were made in relation to 55 distinct episodes of household infection. Of these, 40 occurred in 1956, apparently reflecting a major but silent epidemic of E7 infection. Analysis of the age-immunity profile and of the annual and seasonal occurrence of infection in the study group and of the infection and immunity patterns within households suggests a very close parallelism between the occurrence of E7 virus infection and that of any single poliovirus type.

^* Aided by a grant from the National Foundation, Inc.

Present address: Staatliche Bakteriologische Untersuchungsanstalt, Munich 3, Germany.

Present address: Enterovirus Unit, Laboratory Branch, Communicable Disease Center, Atlanta 22, Georgia.

Present address: Division of Epidemiology, Public Health Research Institute of the City of New York, Inc., New York 9, New York.