Tehran University of Medical Sciences Iranian Journal of Parasitology 1735-7020 6 4 2011 12 15 90 94 EN S Raeghi Dept. of Basic Sciences, School of Medicine, North Khorasan University of Medical Sciences, Bojnurd, Iran &Zoonotic Diseases Research Center, North Khorasan university of Medical Sciences, Bojnurd, Iran A Akaberi Dept. of Social Medicine, School of Medicine, North Khorasan University of Medical Sciences, Bojnurd, Iran S Sedeghi Zoonotic Diseases Research Center, North Khorasan University of Medical Sciences, Bojnurd, Iran 2015 10 03 Background: Toxoplasma gondii is a zoonotic protozoan parasite found worldwide and responsi­ble for major economic losses in most classes of livestock. This study was aimed to deter­mine the prevalence of T. gondii infection in sheep, cattle and horses in Urmia, north-west of Iran, using MAT. Methods: Blood samples of 276 livestock and 26 horses were collected from July 2009 till April 2010. The data were analyzed by the Chi-square, Fisher's Exact and Cochran's and Mantel-Haen­s­zel Tests. The level of significance was set at P < 0.05. Results: Thirty-three (21.1%) sheep, 2 (1.6%) cattle and 3 (11.5%) horses were seropositive to T. gondii. Analysis showed that sheep were 15 times more likely to be seropositive comparing to cattle also 2 times more likely to be seropositive than horses. Conclusion: This study showed seroprevalence of equine T. gondii infection with a considerable rate in sheep in Urmia, northwest of Iran. More comprehensive studies on livestock toxoplasmo­sis are required for further analysis of the parasite reservoir for human infection. https://ijpa.tums.ac.ir/index.php/ijpa/article/view/209 https://ijpa.tums.ac.ir/index.php/ijpa/article/download/209/208