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[그림 13] 포충증 병원체의 생활사 The adult Echinococcus granulosus (3?6 mm long) resides in the small
bowel of the definitive hosts, dogs or other canids. Gravid proglottids release eggs that are passed in the
feces. After ingestion by a suitable intermediate host (under natural conditions: sheep, goat, swine, cattle,
horses, camel), the egg hatches in the small bowel and releases an oncosphere that penetrates the intestinal
wall and migrates through the circulatory system into various organs, especially the liver and lungs. In these
organs, the oncosphere develops into a cyst that enlarges gradually, producing protoscolices and daughter
cysts that fill the cyst interior. The definitive host becomes infected by ingesting the cyst-containing organs
of the infected intermediate host. After ingestion, the protoscolices evaginate, attach to the intestinal mucosa
, and develop into adult stages in 32 to 80 days. The same life cycle occurs with Echinococcus multilocularis
(1.2?3.7 mm), with the following differences:the definitive hosts are foxes, and to a lesser extent dogs,
cats, coyotes and wolves; the intermediate host are small rodents; and larval growth (in the liver) remains
indefinitely in the proliferative stage, resulting in invasion of the surrounding tissues. With Echinococcus
vogeli (up to 5.6 mm long), the definitive hosts are bush dogs and dogs; the intermediate hosts are rodents;
and the larval stage (in the liver, lungs and other organs) develops both externally and internally, resulting
in multiple vesicles. Echinococcus oligarthrus (up to 2.9 mm long) has a life cycle that involves wild felids
as definitive hosts and rodents as intermediate hosts. Humans become infected by ingesting eggs , with
resulting release of oncospheres in the intestine and the development of cysts in various organs. (출처:
Int. J. Infect. Dis. 2009;13:125-133.)
154
[그림 13] 포충증 병원체의 생활사 The adult Echinococcus granulosus (3?6 mm long) resides in the small
bowel of the definitive hosts, dogs or other canids. Gravid proglottids release eggs that are passed in the
feces. After ingestion by a suitable intermediate host (under natural conditions: sheep, goat, swine, cattle,
horses, camel), the egg hatches in the small bowel and releases an oncosphere that penetrates the intestinal
wall and migrates through the circulatory system into various organs, especially the liver and lungs. In these
organs, the oncosphere develops into a cyst that enlarges gradually, producing protoscolices and daughter
cysts that fill the cyst interior. The definitive host becomes infected by ingesting the cyst-containing organs
of the infected intermediate host. After ingestion, the protoscolices evaginate, attach to the intestinal mucosa
, and develop into adult stages in 32 to 80 days. The same life cycle occurs with Echinococcus multilocularis
(1.2?3.7 mm), with the following differences:the definitive hosts are foxes, and to a lesser extent dogs,
cats, coyotes and wolves; the intermediate host are small rodents; and larval growth (in the liver) remains
indefinitely in the proliferative stage, resulting in invasion of the surrounding tissues. With Echinococcus
vogeli (up to 5.6 mm long), the definitive hosts are bush dogs and dogs; the intermediate hosts are rodents;
and the larval stage (in the liver, lungs and other organs) develops both externally and internally, resulting
in multiple vesicles. Echinococcus oligarthrus (up to 2.9 mm long) has a life cycle that involves wild felids
as definitive hosts and rodents as intermediate hosts. Humans become infected by ingesting eggs , with
resulting release of oncospheres in the intestine and the development of cysts in various organs. (출처:
Int. J. Infect. Dis. 2009;13:125-133.)
154
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