The other large strongyles are less of a problem but can cause some significant harm if in large enough numbers. They have not been nearly as harmful as Strongylus vulgaris. Triodotophorus is unique in that is fits into the large strongyle size category but it does not migrate in its larval stages but becomes encysted as small strongyles do.
Between 30%-33% of the samples examined by Horsemen’s Laboratory are positive for worm eggs. 95% of the positive samples are positive for strongyle eggs. Research tells us likely only 5% of those eggs are from large strongyles. Most strongyle eggs appear very similar under a microscope. The eggs must hatch and the larvae must be examined to tell which species of strongyles are present. Most often it is a mixture of several different species.