Platynosomum fastosum (2) Flashcards
What are the final hosts?
Cats
What are the intermediate hosts?
1st intermediate host: Snail
2nd intermediate host: Crustacean
What are the Paratenic hosts?
Lizard
Toads
Geckos
Skinks (obligatory)
Describe adults
Up to 8 mm long
In bile ducts
Describe eggs
Up to 50 micro m long
Oval
Brownish
Medium
Thick shell
Operculate
Explain the life cycle
Eggs pass in feces into water
Snail ingests eggs, develop to miracidia and then cercariae
Cercariae emerge from snail which infect crustaceans, or snails ingested by crustaceans
Metacercariae encyst in crustaceans
Lizard, toad, gecko, or skink ingests crustacean with metacercariae
Cat becomes infected by ingesting IH or PH (lizard)
Develop to juvenile flukes, migrate to bile ducts to develop to adults
PPP: 2-3 months
What is the site of infection?
Bile ducts
Describe the Pathogenesis
Endemic in St. Kitts/Florida
Cause hyperplasia of bile ducts
Nonpathogenic
Heavy infections - results in “lizard poisoning”
What are the clinical signs?
Jaundice (=icterus)
Diarrhea
Vomitting
Lethargy
Enlarged palpable liver
Distended abdomen
Emaciation
Death
How do you diagnose?
Eggs in fecal flotation
How do you treat and prevent?
Praziquantel used
Surgery
What is the common name?
Lizard poisoning
