Fig. 30. Spot map of an outbreak of toxoplasmosis at a riding stable showing a cluster at one end of the arena where a seropositive cat had defecated; Atlanta, GA, 1977. One patient later developed toxoplasmic retinochoroiditis. (Teutsch SM, Juranek DD, Sulzer A, et al: Epidemic toxoplasmosis associated with infected cats. N Engl J Med 300:695, 1979)