Publications by authors named "Duane E Chappell"

Article Synopsis
  • Equine rhinitis B virus (ERBV) is emerging as a significant respiratory pathogen in horses, identified through a biosurveillance program that analyzed 8,684 nasal swabs from 2012 to 2023.
  • Out of the tested samples, ERBV was found in 5.08% of cases, often identified alone (65.99%) or in combination with other pathogens like equine herpesvirus type 4 and equine influenza virus.
  • Young horses and those involved in competition are particularly susceptible, showing symptoms such as fever, nasal discharge, and cough, highlighting the clinical importance of understanding ERBV and its coinfection effects.
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This study aimed to describe selected epidemiological aspects of horses with acute onset of fever and respiratory signs testing qPCR-positive for and to determine the effect of vaccination against on qPCR status. Horses with acute onset of fever and respiratory signs from all regions of the United States were included in a voluntary biosurveillance program from 2008 to 2020 and nasal secretions were tested via qPCR for and common respiratory viruses. A total of 715/9409 equids (7.

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A voluntary upper respiratory biosurveillance program in the USA received 9740 nasal swab submissions during the years 2008-2021 from 333 veterinarians and veterinary clinics. The nasal swabs were submitted for qPCR testing for six common upper respiratory pathogens:equine influenza virus (EIV), equine herpesvirus-1 (EHV-1), equine herpesvirus-4 (EHV-4), subspecies (), equine rhinitis A virus (ERAV), and equine rhinitis B virus (ERBV). Additional testing was performed for equine gamma herpesvirus-2 (EHV-2) and equine gamma herpesvirus-5 (EHV-5) and the results are reported.

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Equine protozoal myeloencephalitis (EPM) has remained a devastating neurological disease of the Americas, especially in young performance horses. Prophylactic treatment strategies with diclazuril have shown to reduce seroprevalence and titer levels to Sarcocystis neurona in healthy horses continuously exposed to the apicomplexan parasite. The goal of this study was to determine if the FDA-labeled dose of 1 mg/kg of 1.

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