ACVM Parasitology Boards Nematodes (Ascaridida) Exam Review questions and answers, 100% Accurate, VERIFIED.[LATEST EXAM UPDATES]

ACVM Parasitology Boards Nematodes (Ascaridida) Exam Review questions and answers, 100% Accurate, VERIFIED. 1 Q Describe the life cycle of Ascaris suum A  Huge adult, up to 30 cm with 3 large lips L# hatches in the stomach or small intestine  Then it enters the wall of the cecum and colon and proceeds to the liver for several days moving into the portal vein  Tunnels around the liver for a few days, migrating to the lungs via CVC, heart and pulmonary capillary  Bursts through pulmonary capillaries and migrates up bronchial tree– Small intestine 2 Q What are the common pathology features of Ascaris suum? A  Mechanical trauma and hypersensitivity reaction  Liver heals by fibrosis - milk spots  Lungs– damage results in “thumps” (audible respiratory effort) and coughing  Can cause diarrhea and interfere with weight gain 3 Q How is Ascaris suum treated? A Hygromycin B, piperazines, dichlorvos, fenbendazole, levamisoles, ivermectin, doramectin, and pyrantel Treating and cleaning sows with warm soapy water 2 weeks before moving to farrowing crates Treating again at weaning Adding pyrantel to feed prevents migration and establishment of A. suum infections as pyrantel is the only approved drug to treat larvae immediately after they hatch in the small intestine 4 Q What two ascarids are models for embyronology? A Parascaris equorum has 2 germline chromosomes and P. univalens has only a single pair