Parasite infections and their risk factors in foals and young horses in Finland.

One-hundred-and-thirty-nine fecal samples were examined to assess the prevalence of Parascaris spp. and strongyle infections in two-year-old or younger horses in Finland. The owners of the horses were asked to answer an online questionnaire about the horses' environment and the management practices of the stable. The results of fecal examination and the survey were analyzed to evaluate the effect of different risk factors as ascertained by the survey on parasite prevalence. The prevalence of Parascaris spp. infections at 11.5% was lower than expected based on previous research and the strongyle prevalence of 57.6% was found in young Finnish horses. Strongyloides westeri and Eimeria leuckarti infections were also found. Pasture hygiene had a stronger influence on the prevalence of strongyle infections than on Parascaris spp. infections, whereas the hygiene routine of the horses' housing was found to be more important in the prevention of Parascaris spp. infections. The planning of the control of parasitic infections should be based on the identified risk factors.