Sera from hogs were analyzed using the modified direct agglutination test(MAT). Serum samples were collected from sows which were part of the National Animal Health Monitoring - System (NAHMS) swine survey. The blood sera on file represented-3?4:randomly selected hog . farms throughout the United States. Additionally, the NAHMS survey included information on type of production facilities and level of cat, dog, or bird access to the facilities. Of the sows; tested 19 percent tested positive for toxoplasmosis.