Lung Flukes: Paragonimus westermani Flashcards
Common name of Paragonimus westermani
- Oriental Lung Fluke
Final Host of Paragonimus westermani
Humans
Reservoir Host of Paragonimus westermani
- Dogs
- Cats
- Field
- Rats
Paratenic Host of Paragonimus westermani
- Boars
- Pigs
1st IH of Paragonimus westermani
- Antemelania asperata/Brotia asperata and
- Antemelania dactylus (snail)
2nd IH of Paragonimus westermani
(Crustaceans)
(Crustaceans)
● Sundathelphusa philippina/Parathelphusa grapsoides (freshwater crab);
in other countries, other crustacean are possible such as cray fish.
Infective stage of Paragonimus westermani
Metacercaria
MOT of Paragonimus westermani
Ingestion of undercooked crabs harboring the metacercariae
Habitat in man of P. westermani
Lungs
Characteristics of P. westermani
- Reddish-bronw
- Resembles a coffee bean
- Rounded anteriorly
- slighly tapered posteriorly
Sample used in P. westermani
- Sputum or Sputum Bronchial Washing
Can we use stool as sample in P. westermani?
Yes, but not always. If and only if you ingested the supposed sputum sample then it will reach digestive tract —>stool
Diagnosis of P. westermani
- Microscopy (sputum)
- Suputum conc. with 3% sodium hydroxide
- Chest radiographs
- Peripheral blood count
- Immunological methods (CF test, intradermal test, double diffusion in agarose gel, and immunoelectrophoresis, IB, ELISA)
- Lamp test
- CT Scan, MRI
P. westermani : What chemical is added in Sputum concentration?
3% Sodium hydroxide
P. westermani: What is the purpose of adding 3% sodium hydroxide in sputum concentration?
- To remove mucus which is thick
