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KMID : 0371919910040010166
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Journal of Wonju College of Medicine
1991 Volume.4 No. 1 p.166 ~ p.171
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Domestic Fowl as a Paratenic Host of Paragonimus westermani
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Abstract
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It has been known that ingestion of the Paragonimus metacercariae encysted in the second intermediate ´hosts directly causes human paragonimiasis. However, the possibilities of Paragonimus infection by the paratenic hosts in the process cycling from the 2nd intermediate hosts to the definitive hosts have been suggested, since Norimatsu et al.(1975) and Miyazaki et al.(1978) reported wild boar meat as a source of human paragonimiasis.
Authors have seen that there were food habits such as eating raw chicken with spices and thick soypaste mixed with red peppers, and that there were cases of feeding freshwater tray-fish to chickens in some mountainous areas of Kangwon province. These experience sprovide a reason to examine a possibility of Paragonimus infection by eating chickens, a possible paratenic host of P. westermani.
This study was attempted as an experiment by infection P. westermani metacercariae into the chickens in order to know whether the chickens can play a role as the paratenic host of the lung fluke.
A few juvenile worms migrated mainly into the muscles of chickens experimentally infected with the metacercariae of Paragonimus westermani(detection rate: 4.296). Mean size of the juvenile worms detected 4 weeks after infection with the metacercariae was 2.33 x1.60 mm, and the ovaries and testes of the worms were poorly developed at that time.
The juvenile worms migrating the muscle tissues of chickens were collected and ingested into a cat known as the favorable final host.
The matured adult worms(mean size: 6.55 x 3.43 mm) were finally detected in the thoracic cvity of the cat which was sacrificed 60 days after being infected with the juvenile worms.
Summarizing the above results, it is experimentally confirmed that the domestic chickens have a possibility to serve as the paratenic host and as the source of P. westermani infection.
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