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Benvin, Iva; Perko, Vesna Mojčec; Maljković, Maja Maurić; Habuš, Josipa; Štritof, Zrinka; Hađina, Suzana; Perharić, Matko; Zečević, Iva; Cvetnić, Marija; Turk, Nenad
Journal of equine veterinary science, August 2023, 2023-08-00, 20230801, Letnik: 127Journal Article
•Leptospira spp. infections in horses are highly present in Croatia.•High seropositivity for the serovar Pomona in apparently healthy horses.•Possible evolutionary adaptation of pathogenic serovar Pomona as dominant for horses.•Horses are at risk of being convalescents and potential sources of infection. Leptospirosis is re-emerging zoonotic bacterial disease of global importance that affects domestic and wild animals and humans. Due to the public health importance, control of disease in Croatia is being implemented by monitoring the seroprevalence of equine leptospirosis and it is regulated by the law. In the period from 2012 to 2022, a total of 61,724 serum samples from apparently healthy horses were admitted to the Laboratory for leptospires, Faculty of Veterinary Medicine University of Zagreb. Serum samples were tested for Leptospira spp. antibodies using the microscopic agglutination test (MAT). Samples were considered seropositive with a cut-off titre 1:200 for Bratislava and 1:400 for other Leptospira spp. serovars. Out of 61,724 serum samples tested, 6,665 (10.80%) were found seropositive for at least one Leptospira serovar. In the studied period, seroprevalence varied between 5.00% and 15.94%. The highest seroprevalence was found for serovar Pomona (41.98%) and serovar Grippotyphosa (31.34%), followed by Sejroe (8.03%), Icterohaemorrhagiae (7.05%) and Bratislava (6.47%). Results indicated that horses in Croatia are particularly exposed to Leptospira spp. infections. The most prevalent presumed infective serovar was Pomona increasing each year. Investigated horses were randomly selected and healthy and most seropositive horses have anamnestic titre due to previous infection. This is the first study in Europe reporting such high seropositivity for the serovar Pomona in apparently healthy horses. According to the results of the present study, the question arises of the possible evolutionary adaptation of the pathogenic serovar Pomona as dominant for horses.
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