highly significantp < 0.0001
Rat control on the farm A highly significant difference (χ 2 = 33.4543 p < 0.0001) was observed in the number of T. gondii positive animals among the properties that use cats for rat control (n = 239; 20 positive animals; prevalence 1.73%) and those that do not use them (n = 885; 12 positive 1 animals; prevalence 1.03%).