PATH 1000 FINAL EXAM QUESTIONS AND ANSWERS WITH
COMPLETE SOLUTIONS VERIFIED
arthropods/arachnids
insects -- directly cause disease or act as vectors of other agents
direct lifecycle
only one host needed for complete parasitic development (from egg to adult to egg)
- whip worms... eggs passed in feces of infected animal, dog eats eggs, grow in
intestine and pass out again
indirect lifecycle
more than one host is required for parasite to develop from egg to adult to egg
- adult stage infects host, eggs grow and enter environment
- intermediate host allows growth out of eggs and then infects primary host
ex. Tapeworms... eggs in feces, go into flea/lice/rats, intermediate host ingest
parasites with indirect and direct lifecycles
round worms, hookworms
definitive host
host in which the parasite can complete its lifecycle
intermediate host
host that an immature form of the parasite may infect
parasite may develop into various forms within the host and then become a source of
infection for other intermediates or definitive hosts
Hameonchus contortus (barbers pole worm)
, host: sheep, goat, cattle
site: abomasum
lifecycle: direct, prepatent period
disease: worm suck blood causing anemia, bottle jaw
Dipylidium spp (cestode/tapeworm)
host: dog, cat
site: small intestine
life cycle: indirect
disease: weight loss, diarrhea
dipylidium caninum
common dog and cat tape worm
- not direct, needs intermediate host
human trematodiasis
clonorchis, chinese, paragonimus, fasciola, opisthorchus
- indirect life cycle
- bile stasis, carcinoma
- from fresh water facilities with poor sanitation, raw fish
- use a fluke finder to diagnose
toxoplasma gondii (toxoplasmos)
protozoal
intermediate host: sheep and all animals
definitive host: CAT
COMPLETE SOLUTIONS VERIFIED
arthropods/arachnids
insects -- directly cause disease or act as vectors of other agents
direct lifecycle
only one host needed for complete parasitic development (from egg to adult to egg)
- whip worms... eggs passed in feces of infected animal, dog eats eggs, grow in
intestine and pass out again
indirect lifecycle
more than one host is required for parasite to develop from egg to adult to egg
- adult stage infects host, eggs grow and enter environment
- intermediate host allows growth out of eggs and then infects primary host
ex. Tapeworms... eggs in feces, go into flea/lice/rats, intermediate host ingest
parasites with indirect and direct lifecycles
round worms, hookworms
definitive host
host in which the parasite can complete its lifecycle
intermediate host
host that an immature form of the parasite may infect
parasite may develop into various forms within the host and then become a source of
infection for other intermediates or definitive hosts
Hameonchus contortus (barbers pole worm)
, host: sheep, goat, cattle
site: abomasum
lifecycle: direct, prepatent period
disease: worm suck blood causing anemia, bottle jaw
Dipylidium spp (cestode/tapeworm)
host: dog, cat
site: small intestine
life cycle: indirect
disease: weight loss, diarrhea
dipylidium caninum
common dog and cat tape worm
- not direct, needs intermediate host
human trematodiasis
clonorchis, chinese, paragonimus, fasciola, opisthorchus
- indirect life cycle
- bile stasis, carcinoma
- from fresh water facilities with poor sanitation, raw fish
- use a fluke finder to diagnose
toxoplasma gondii (toxoplasmos)
protozoal
intermediate host: sheep and all animals
definitive host: CAT
