Pathophysiological studies by Duncan and Dargie have shown that 30ml of blood may be lost per day by foals infected with 75-100 Strongylus vulgaris adults. These ulcers appear to heal readily after the feeding worms move on. S trongylus vulgaris feeding by drawing a plug of mucosa into its buccal cavity. Image courtesy of Dr. Harold Drudge Strongylus edentatus feeding by drawing a plug of mucosa into its buccal cavity. Image courtesy of Merial Inc Large strongyles attached to the mucosa.
Red dots are sites of previous attachments.