A comparative study of single Theileria lestoquardi and mixed infections with Theileria ovis

Abstract Background Epidemiological surveys in Oman have revealed a high prevalence of the co-occurrence pathogenic Theileria lestoquardi and non-pathogenic ovis among sheep Barka region, Oman. Our most recent data illustrated an interaction reduced mortality risk animals co-infected with T. , suggesting that latter confers protection against pathogenicity . The present study extends above findings examines disease outcomes; clinical markers, hematological parameters, parasite density mixed single infections. Methods A total 390 blood samples were collected from 16 pens located Barka, between July November 2019. spp. detected quantified using qPCR assay targeting 18S rRNA extent genetic diversity was estimated by panel specific micro- mini-satellites. association some markers presence tested. Results 75 (19.2%) sheep; these 65 (86.7%) had infections ( plus ), 8 (10.6%) infected alone, 2 (2.7%) only Exotic breeds higher for infection. gene copies) both parasites infection infection, there relatively lower However, no difference indices High observed differences seen He = 0.772) than reported 2019 0.582), distinct genotypes. Conclusion as compared to supports hypothesis lethal correlations (clinical parasites) or two types genotypes earlier Oman, likely reflects movement carrier highlights need further analysis populations inform novel approaches controlling malignant ovine theileriosis. Graphical