TROPICAL DESEASES 11

3. HYDATID DISEASE

The disease is caused by the ingestion of ova of Eccinococcus
granuloses (tape worm) by man.
- The tape worm lives in the intestine of dogs (definitive host),
man; sheep and cattle are the intermediate hosts (Fig.9.6)
- The ova on ingestion develops into embryos that penetrate the
intestinal mucosa and enter the portal circulation, 80% of all
cysts are formed in the liver in man.
- The cysts are slow in growth, and consist of an inner germinal
layer within which are the brood capsule, and the scolices, which
are the heads of future worms.
- When the organs of a dead sheep or cattle containing hydatid
cysts are fed on by the canine species, the worm develops in the
intestine of the animal and once again they shed ova in the
feaces and if ingested through contact with dogs or contaminated
vegetable or water by the intermediate hosts, the life cycle of
the parasite is completed.

- The tape worm lives in the intestine of dogs (definitive host),
man; sheep and cattle are the intermediate hosts (Fig.9.6)
- The ova on ingestion develops into embryos that penetrate the
intestinal mucosa and enter the portal circulation, 80% of all
cysts are formed in the liver in man.
- The cysts are slow in growth, and consist of an inner germinal
layer within which are the brood capsule, and the scolices, which
are the heads of future worms.
- When the organs of a dead sheep or cattle containing hydatid
cysts are fed on by the canine species, the worm develops in the
intestine of the animal and once again they shed ova in the
feaces and if ingested through contact with dogs or contaminated
vegetable or water by the intermediate hosts, the life cycle of
the parasite is completed.
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