5 Written questions
5 Matching questions
- How to diagnose D. dendriticum? Treatment? Control?
- Diagnosis of p. westermani - can often be mistaken for, in brain?
- Common name for D. dendriticum - why?
- Does not require aquatic habitat to complete life cycle
- D. dendriticum has how many I.H.? What are they
- a finds eggs in sputum or feces, biopsy, ELISA, x ray or CT. Can often be mistaken for tuberculosis, pneumonia, spirochaetosis in lungs, or tumors, encephalitis, hydatids in brains.
- b Most are asymptomatic - look for eggs in feces. Treat with praziquantel, expensive, or benzimidazoles. Control is difficult because of crazy life cycle. - snails and ants hard to control. Have to keep tabs on your grazing times.
- c D. dendriticum
- d Lancet fluke, pointed body
- e 2. 1ST I.H. = Snail. 2nd = Ant
5 Multiple choice questions
- Europe, Asia - 45% of cattle in switzerland. Some in USA and Australia. Habitat is grasslands where herbivores graze.
- 1. Adults in DH live in lungs, pair up 2. Eggs in sputum or swallowed and passed in feces. 3. After at least 16 days in water miracidium hatches. 4. Thieridae snail is IH. 5. adult/egg/miracidium/sporocyst/redia/cercaria ( inside snail
- 1. 1 of 7 or more known species of Paragonimus that infect humans. 2. Adult resides in the lung 3. DH is many carnivorous animals. I.H is snail, then 2nd IH is freshwater crab and crayfish. Paratenic hosts possible if birds or small mammals eat crayfish or crabs
- P. westermani
- 1. distome 2. pointed ends 3. Testes are anterior to ovary. Prominent uterus, 4. Operculated egg 5. Vittelline glands occupy the middle third of the organism.
5 True/False questions
D.H for D. dendriticum are → Lancet fluke, pointed body
Pickling does not kill → Praziquantel.
Dicrocoelium dendriticum and Paragonimus westermani are 1. mono/di genean parasites? 2. mono/heteroxenous 3. hosts 4. size → 1. digenean 2. indirect life cycles - 2 I.H. 3. First I.H is a snail 4. D. dendriticum similar in length as P. westermani, but half the size.
Paragonimus westermani - 1. acetabulum 2. sex 3. morphology 4. tegument 5. reproductive system → 1. distome 2. monoecious but prefers cross fertilization 3. Adults look like coffee beans and are unusually thick 4. Tegument covered in spines 5. reproductive system - ovaries left of midline, vitelline follicles at lateral ends.
Pathology of D. dendriticum is similar to x except. Symptoms → F. hepatica -except that there is no trauma to gut wall or liver parenchyma due to juvenile migration. You see a lot of biliary and liver damage -inflammation, fibrosis, hepatic degeneration, cirrhosis, bile duct distention/dysfunction