Retrospective study on equine viral abortions in Poland between 1999 and 2022

Abstract Introduction Loss of pregnancy in mares is a major cause economic and emotional impact for horse breeders. It can have many different infectious noninfectious causes. The aim this study was identification the main viral causes abortion Poland based on tissue samples from 180 aborted foetuses submitted testing between 1999 2022. Material Methods Tissues collected studs throughout were tested presence equine herpesvirus types 1 4 (EHV-1/-4) if negative, arteritis virus (EAV). examination performed using PCR/reverse transcriptase PCR (1999–2012) quantitative (2013–2022). Results determined to be EHV-1 49.4% cases ( n = 89), whereas no EHV-4- or EAV-positive found. proportion abortions due differed regions, with highest percentage Lubelskie Wielkopolskie provinces. Conclusion results indicate that most important agent causing Poland.