5 Written questions
5 Matching questions
- Common name for Paragonimus westermani
- 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
- Geographic distribution of D. dendriticum - habitat?
- D.H for D. dendriticum are
- D. dendriticum - 1. Acetabulum 2. morphology 3. reproductive system 4. egg 5. what occupies middle third of organism?
- a 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
- b lung fluke
- c 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.
- d sheep, cattle, goats, pigs
- e Europe, Asia - 45% of cattle in switzerland. Some in USA and Australia. Habitat is grasslands where herbivores graze.
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
- D. dendriticum
- Asia, Africa, Central and South America. About 20 million people infected. Habitat is swift flowing streams and snail habitats.
- 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.
- 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
Paragonimus westermani - how many species known to infect humans? 2. Adult resides where? 3. Hosts - anything unusual? → 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
John and his gf went out and had crab at a sketchy restaurant and now he is having breathing difficulties, what could he have? → 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.
Pathology of D. dendriticum is similar to x except. Symptoms → because we don't eat infected ants on grass.
Pickling does not kill → Praziquantel.
Common name for D. dendriticum - why? → Lancet fluke, pointed body