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Article Dans Une Revue Journal of Equine Veterinary Science Année : 2023

Equine herpesvirus-1 outbreak during a show-jumping competition: a clinical and epidemiological study

Résumé

A total of 752 horses were involved in the CES Valencia Spring Tour 2021. Due to an equine herpesvirus-1 (EHV-1) outbreak, the competition was cancelled and the site was locked down. The objective of this study was to describe epidemiological, clinical, diagnostic and outcome data of the 160 horses remaining in Valencia. Clinical and quantitative polymerase chain reaction (qPCR) data were analysed for 60 horses in a retrospective case-control observational study. The risk of developing clinical manifestations was explored using a logistic regression approach. EHV-1 was detected by qPCR, genotyped as A2254 (ORF30) and isolated on cell culture. From the 60 horses, 50 (83.3%) showed fever, 30 horses (50%) showed no further signs and 20 (40%) showed neurological signs, with 8 horses (16%) hospitalised, of which 2 died (3%). Stallions and geldings were 6 times more likely to develop EHV-1 infection compared to mares. Horses older than 9 years, or housed in the middle of the tent were more likely to develop EHV-1 myeloencephalopathy (EHM). These data show that for EHV-1 infection, the risk factor was male sex. For EHM the risk factors were age >9 yo and location in the middle of the tent. These data highlight the crucial role of stable design, position, and ventilation in EHV-outbreaks. It also showed that PCR testing of the horses was important to manage the quarantine.
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Dates et versions

hal-04142597 , version 1 (06-07-2023)

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Anne Couroucé, Camille Normand, Caroline Tessier, Rita Pomares, Jérôme Thévenot, et al.. Equine herpesvirus-1 outbreak during a show-jumping competition: a clinical and epidemiological study. Journal of Equine Veterinary Science, 2023, pp.104869. ⟨10.1016/j.jevs.2023.104869⟩. ⟨hal-04142597⟩
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