SOME EPIZOOTIOLOGICAL FEATURES AND PATHOGENETIC ASPECTS OF FELINE CHLAMYDIOSIS IN THE PODILSKYI REGION

Abstract

Feline chlamydiosis, caused by Chlamydia felis, is one of the common bacterial infections of companion animals, significant both in veterinary medicine and in terms of zoonotic risk. Epizootiological studies indicate that the prevalence of infection in cats depends on age, breed, seasonality, housing conditions, and the level of veterinary preventive measures. The present study aimed to conduct an epizootic survey of chlamydial infection in cats in Kamianets-Podilskyi, and to analyze age-related, seasonal, and breedrelated dynamics, as well as their impact on the hematological parameters of affected animals. Based on the results of investigations carried out in 2024–2025, frequent cases of feline chlamydiosis were recorded in Kamianets- Podilskyi. Within the structure of infectious diseases in cats during the study period, chlamydial monoinfection was diagnosed in 36% of cases. The peak incidence was observed in cats aged 2–6 months (48.5%). In terms of seasonality, the highest rates of infection were registered in the spring–summer period, with the maximum prevalence recorded in June (18.4%). A secondary peak occurred in September (13.3%). The infection rate in females was 7.5% higher compared to males. Regarding breed distribution, a greater number of cases were identified among non-pedigree cats, as well as British Shorthair and Scottish Fold breeds. Hematological analysis revealed leukocytosis as the most common finding in infected cats; neutrophilia was occasionally observed, indicating acute inflammation of mucous membranes, while lymphocytosis was registered in protracted or chronic cases. Other hematological parameters remained largely within normal ranges. Thus, due to the frequent occurrence of feline chlamydiosis in this region, preventive measures should include avoiding contact with stray animals, regular veterinary examinations, and timely vaccination.