Publication date: Feb 01, 2025

Respiratory disorders (RDs) are a common transport-related welfare consequence in horses. This prospective study described the journeys of horses transported to two slaughterhouses in Italy, documented the prevalence of potentially RD-related pathogens, and identified possible predisposing factors. Data were recorded from arrival until 48 h after arrival and included the collection of Deep Nasopharyngeal Swabs (DNS), journey details and welfare assessment of horses (n = 155). PCR was used to quantify the presence of influenza A virus, reovirus, equine herpesvirus type 1 and 4, adenovirus, rhinovirus, astrovirus, equine coronavirus, Pasteurellaceae, Streptococcus equi sub. equi and sub. zooepidemicus. One horse each tested positive for reovirus, and rhinovirus and two horses tested positive for adenovirus. The prevalence of Streptococcus equi and zooepidemicus and Pasteurellaceae was 4 %, 19 % and 63 % respectively. Streptococcaceae and Pasteurellaceae were associated with sweating (P

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