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Contact Transmission of the Highlands J Strain of Western Equine Encephalomyelitis in Chicks^*

A. T. C. Bourke

In five out of seven experiments the Highlands J strain of Western equine encephalomyelitis (WEE) was transmitted by contact among infant chicks. Contacts were infected in cramped, limited, and oral environments, but not in fecal or air-borne environments. The infection was probably disseminated by the ingestion of infective oral secretions. Previous investigations conducted on three strains of WEE and eight strains of eastern equine encephalomyelitis are briefly discussed.

^* A preliminary report on the contact transmission of HJ-WEE was incorporated in a thesis submitted by the author to the Department of Epidemiology and Public Health, Yale University, in partial fulfillment of the requirements for the degree of Doctor of Public Health. These and other studies were contained in a thesis submitted by the author to the University of Dublin, in partial fulfillment of the requirements for the degree of Doctor in Medicine. They were conducted under the auspices of the Commission of Viral Diseases of the U. S. Armed Forces Epidemiological Board and were supported in part by the Office of the Surgeon General, Department of the Army, and in part by a grant (E-1512) from the U. S. Public Health Service.

Trainee in Epidemiology. Present address: Department of Virus Diseases, Division of Communicable Diseases and Immunology, Walter Reed Army Institute of Research, Walter Reed Army Medical Center, Washington, D. C.