Exam I - Platynosomum fastosum Flashcards
What is the common disease condition associated with Platynosomum fastosum?
Lizard poisoning
What is/are the final host(s) for Platynosomum fastosum?
cat
What is/are the intermediate host(s) for Platynosomum fastosum?
1st intermediate host is a snail
2nd intermediate host if a crustacean
What is/are the paratenic host(s) for Platynosomum fastosum?
The 3rd host for *Platynosomum fastosum *is an obligate paratenic host and may be a lizard, toad, gecko, or skink
Describe the appearance of the Platynosomum fastosum egg
Egg is oval, brownish, medium-thick shell, operculate, up to 50 um
How large can Platynosomum fastosum adults be?
Adult flukes are ~8 mm in length
Describe the life cycle of Platynosomum fastosum.
- Eggs pass in feces into water
- Snails ingest eggs, develop to miracidia and then cercariae
- Cercariae emerge from snails, which infect crustaceans
- Metacercariae encyst in crustaceans
- Lizard ingests crustacean with metacercariae
- Cat becomes infected when it ingests these hosts. These develop to juvenile flukes, migrate to bile ducts to develop to adults. PPP is 3 months
What is the PPP for Platynosomum fastosum?
3 months
What is/are the site(s) of infection for Platynosomum fastosum?
Bile ducts
Describe the pathogenesis associated with Platynosomum fastosum.
Flukes cause hyperplasia of the bile ducts, thickened bile ducts, which obstruction of the bile ducts and pancreas
What are some clinical signs associated with heavy infections of Platynosomum fastosum?
Heavy infections will result in lizard poisoning:
- cirrhosis
- jaundice
- diarrhea
- vomiting
- lethargy
- enlarged palpable liver with distended abdomen
- emaciation
- DEATH
Which diagnostic tool(s) would be appropriate for diagnosing Platynosomum fastosum?
Eggs on fecal sedimentation exam.
If bile ducts are obstructed there will be no eggs in feces.
