5 Written Questions
5 Matching Questions
- Paragonimus westermani - how many species known to infect humans? 2. Adult resides where? 3. Hosts - anything unusual?
- Paragonimus westermani - 1. adults live where and how? 2. Eggs passed how? 3. After how long does egg hatch 4. What species of snail is IH? 5. Life stages
- Life cycle of D. dendriticum (probs the only important thing to know about it)
- D. dendriticum adults live in
- Treat P. westermani with
- a bile duct
- b 1. Eggs in feces 2. (Cionella lubrica in U.S snail eats egg) 3. Miracidium in snail intestine to digestive gland 4. mother sporocyst to daughter sporocyst 5. no redia - to cercaria (tailed). 6. Cercaria accumulate in mantle cavity and irritation causes mucous building and slime balls 7. (Formica fusca ant eats slime ball and ingest cercaria) 8. Cercaria penetrate ant gut and encysts as metacercaria inside ant hemocoel 8. One cercaria migrates to subesophageal ganglion and becomes brainworm and alters ant behavior. Remains at grass tip and eaten 9. Ruminent eats ant and metacercaria excyst in duodenum, juveniles migrates to bile duct. Adults in bile duct produce eggs.
- c Praziquantel.
- d 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
- e 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
5 Multiple Choice Questions
- Adult in lung, eggs in sputum or swallowed and in feces. 2. eggs hatch to miracidium 3. miracidium in snail to sporocyst to redia to cercaria 4. spined cercaria with knob tails are released to invade 2nd I.H like crab or crayfish. 5. they encyst as metacercaria and 2nd I.h eats them. 6. excyst in duodenum of 2nd IH. 7. Juvenile penetrate the intestine and embed in abdominal wall. 8. we eat the 2ND IH 9. Juvi's reenter coelom, penetrate coelom and migrate to our lungs. 10. They find a mate, and form cyst in lungs. 11. mature into adults
- Lancet fluke, pointed body
- P. westermani.
- 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
- Europe, Asia - 45% of cattle in switzerland. Some in USA and Australia. Habitat is grasslands where herbivores graze.
5 True/False Questions
Pathology and Symptoms of P. westermani → lung fluke
D. dendriticum has how many I.H.? What are they → bile duct
Geographic distribution of Paragonimus westermani → Asia, Africa, Central and South America. About 20 million people infected. Habitat is swift flowing streams and snail habitats.
Common name for Paragonimus westermani → Lancet fluke, pointed body
How to diagnose D. dendriticum? Treatment? Control? → because we don't eat infected ants on grass.