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Prevalence of Strongylus vulgaris A) in relation to the age of the horses. The horses were clustered in age groups 0–5; 6–10; 11–15; 16–20 and ≥ 21 years., B) in relation to faecal egg counts clustered as follow: 0; 50–150; 200–450; 500–800; ≥850 eggs per g of faeces (EPG). C) in relation to last deworming. The vertical lines in A–C indicate the 95% confidence intervals.
