Isolation of Toxoplasma gondii from a naturally infected beef cow

Toxoplasma gondii was isolated from the intestinal wall of an adult shorthorn cow. The cow had an antibody titer of 1:1,600 in the T. gondii agglutination test using formalin-fixed whole tachyzoites. The strain of the parasite designated CT-1 was lethal to mice. This is the first report of the recovery of viable T. gondii from a naturally infected cow in the United States.