US-wide equine strongylid egg count data demonstrate seasonal and regional trends

Martin K. Nielsen*, Paul Slusarewicz, Tetiana A. Kuzmina, Matthew J. Denwood

*Corresponding author af dette arbejde

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

1 Citationer (Scopus)

Abstract

Equine strongylid parasites are ubiquitous around the world and are main targets of parasite control programs. In recent years, automated fecal egg counting systems based on image analysis have become available allowing for collection and analysis of large -scale egg count data. This study aimed to evaluate equine strongylid fecal egg count (FEC) data generated with an automated system over three years in the US with specific attention to seasonal and regional trends in egg count magnitude and sampling activity. Five US regions were defined; North East, South East, North Central, South Central, and West. The data set included state, region, and zip code for each FEC. The number of FECs falling in each of the following categories were recorded: 1) 0 eggs per gram (EPG), 2) 1≤200 EPG, 3) 201≤500 EPG, and 4) >500 EPG. The data included 58, 329 FECs. A fixed effects model was constructed fitting the number of samples analyzed per month, year, and region, and a mixed effects model was constructed to fit the number of FECs falling in each of the four egg count categories defined above. The overall proportion of horses responsible for 80% of the total FEC output was 18.1%, and this was consistent across years, months, and all regions except West, where the proportion was closer to 12%. Statistical analyses showed significant seasonal trends and regional differences of sampling frequency and FEC category. The data demonstrated that veterinarians tended to follow a biphasic pattern when monitoring strongylid FECs in horses, regardless of location.

OriginalsprogEngelsk
TidsskriftParasitology
Vol/bind6
Sider (fra-til)579-586
ISSN0031-1820
DOI
StatusUdgivet - 2024

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