5 Written questions
5 Matching questions
- How to diagnose D. dendriticum? Treatment? Control?
- Geographic distribution of Paragonimus westermani
- D. dendriticum adults live in
- Life cycle of D. dendriticum (probs the only important thing to know about it)
- D. dendriticum has how many I.H.? What are they
- a Asia, Africa, Central and South America. About 20 million people infected. Habitat is swift flowing streams and snail habitats.
- 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 bile duct
- d 2. 1ST I.H. = Snail. 2nd = Ant
- e 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.
5 Multiple choice questions
- 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
- 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
- because we don't eat infected ants on grass.
- sheep, cattle, goats, pigs
- 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.
5 True/False questions
Pathology and Symptoms of P. westermani → Migration of juveniles through coelom to lungs doesn't cause much damage, unless certain special tissues are hit. But once they get into lungs they stimulate an inflammatory response that surrounds the pair in granular tissue - causing ulcers, bleeding, fibrosis. Eggs form granulomas. Symptoms are breathing difficulties, chronic cough, bloody sputum - and if juvis migrate to spinal cord or heart or brain they can cause paralysis, heart attack or death from granulomas.
Pathology of D. dendriticum is similar to x except. Symptoms → because we don't eat infected ants on grass.
Does not require aquatic habitat to complete life cycle → D. dendriticum
Diagnosis of p. westermani - can often be mistaken for, in brain? → 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.
Geographic distribution of D. dendriticum - habitat? → Asia, Africa, Central and South America. About 20 million people infected. Habitat is swift flowing streams and snail habitats.