Haematological and Biochemical Profiles, Including Vitamin A and Zinc Status, in Clinical and Subclinical Oriental Theileriosis in Cattle

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Aim: The present study investigated the clinical, haematological and biochemical profiles in cattle infected with Theileria orientalis, correlating disease severity with various parameters. Study Design: A total of 32 clinically ill, 10 subclinically infected, and 10 healthy control animals were included. Place and Duration of Study: Department of Veterinary Epidemiology and Preventive Medicine, College of Veterinary and Animal Sciences, Kerala Veterinary and Animal Sciences University, Pookode, Wayanad, Kerala, between November 2023 to September 2024. Methodology: Theileria piroplasms, observed via Giemsa staining, appeared as thick and thin rods with trailing cytoplasm and annular, pyriform, garland, and signet-ring shapes. PCR amplification of the T. orientalis major piroplasm surface protein (MPSP) yielded a specific 776 bp product in clinically and subclinically infected animals. Results: Haematological analysis revealed significant anaemia and thrombocytopenia in infected groups, without notable changes in leukocyte counts. Serum protein analysis indicated hypoproteinemia and hypoalbuminemia, while liver enzymes, particularly AST, were elevated in clinically infected cattle, suggesting hepatic involvement. Additionally, serum vitamin A and zinc concentrations were significantly lower in infected cattle, underscoring a possible role for oxidative stress in disease pathogenesis. Conclusion: These findings suggest that T. orientalis infection is associated with multi-systemic impacts, including haematological abnormalities, liver damage, and nutrient deficiencies, which are crucial for accurate diagnosis and effective management strategies.