Flashcards in Paragonimus kellicotti (1) Deck (11)
What is the common name?
What are the final hosts?
What are the intermediate hosts?
1st intermediate host: Snail
2nd intermediate host: Crayfish
Up to 16 mm long
Found in cysts in pairs
80-110 micro m long
Explain the life cycle
Eggs found in pulmonary cyst, swallowed, pass in feces
Eggs reach water, miracidia emerge, penetrate snail
Cercariae emerge from the soil
Penetrate crayfish, form metacercariae
Dog or cat ingests crayfish
Juvenile cyst encysts in intestine, penetrates gut wall, migrates through peritoneal cavity, diaphragm, pleural cavity, penetrates lungs to mature in lung parenchyma
Pairs found in cysts
Adults develop in lungs
Adults long lived (1-4 years)
PPP: Dogs - 4-5 weeks
Cats - up to 10 weeks
What is the site of infection?
Describe the Pathogenesis
Developing flukes cause formation of pulmonary cysts
Evident on thoracic radiographs
Clinical signs absent or mild with intermittent cough
Chronic, low grade cough and pneumonia can develop
- Death rare
- Severe cough
How do you diagnose?
Radiographs reveal cysts
Sedimentation method for eggs
How do you treat and prevent?
Access to hosts difficult to prevent