The pathogenesis of an attenuated and an unattenuated strain of Venezuelan equine encephalomyelitis (VEE) virus was studied in young adult mice by means of infectivity titrations and fluorescent antibody staining. Tissue infectivity and viral lethality were generally similar in mice inoculated intracerebrally (i.c.) or subcutaneously (s.c.) with unattenuated virus and i.c. with attenuated virus. The tissues most involved were brain, salivary glands, inguinal nodes and spleen. Mice inoculated s.c. with attenuated VEE virus survived the infection. Little virus was found in the brain.

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Supported by a grant from the United States Army Biological Laboratories, Ft. Detrick, Maryland.

In conducting the research project herein, the investigators adhered to “Principles of Laboratory Animal Care” as established by the National Society for Medical Research.

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