Prevalence of Strongylus vulgaris in horses after ten years of prescription usage of anthelmintics in Sweden.

•Three-fold increase of Stronylus vulgaris prevalence in horses in Sweden.•2.9 increased odds risk of S. vulgaris on farms only performing faecal egg counts.•No association between the prevalence of S. vulgaris and egg counts or horse age.•No association between the prevalence of S. vulgaris and signs of colic on the farms.