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Psittacosis Complement-Fixing Antibodies in Sera from Fauna of the Great Salt Lake Desert of Utah^*

Robert W. Sidwell, David L. Lundgren AND Bert D. Thorpe

A total of 2,427 wild mammal and bird sera obtained from animals trapped in the desert region of western Utah was tested for the presence of psittacosis group complement-fixing antibodies. Of these, 51 were seropositive at titers of 1:16 to 1:128. The positive sera were from jackrabbits, Ord and chisel-toothed kangaroo rats, antelope squirrels, deer mice, grasshopper mice, desert wood rats, a western harvest mouse, a cottontail rabbit, a rock squirrel, a house cat, a mountain lion, a mule deer and a domestic pigeon. The psittacosis agent was isolated from the domestic pigeon only, although mammalian tissues were also examined for the organism. The possibility of a nonspecific serological reaction in the positive mammalian sera is discussed.

^* This work was accomplished under U. S. Army Chemical Corps Contracts Nos. DA-42-007-403-CML-355, DA-42-007-403-CML-427, and DA-18-064-CML-2639, with the University of Utah.

This is Ecology and Epizoology Contribution No. 99.

The experimental animals used in these studies were fed, housed and cared for in a humane manner and such care was supervised by a competent biologist (AR 70–18).

Present address: Chemotherapy Division, Southern Research Institute, Birmingham, Alabama.