Roundworm—Trichostongylus: Trichostrongyliasis is caused by the roundworm species of Trichostrongylus, Haemonchus and Ostertagia. This worm is common in cattle and other ruminants and can be passed through the fecal-oral route. Some people get infected because they use cattle dung as a heat source. 

Symptoms of Trichostongylus are not as obvious as with some of the other roundworm species and include diarrhea, abdominal pain, and lack of appetite or weight loss. 

Treatment is with Pyrantel Pamoate.