Dogs are definitive host of Echinococcosis while herbivores and man are intermediate hosts that develop hydatid cyst.
To the best of my knowledge, the eggs would simply pass through the digestive tract and be eliminated in the feces. As you say, canids are definitive hosts not intermediates.
Dear Dr. Raad
“Dogs can be considered as rare intermediate host for E.multilocularis.”
This rare case was mentioned in the following paper:
Peregrine, Andrew S., et al. "Alveolar hydatid disease (Echinococcus multilocularis) in the liver of a Canadian dog in British Columbia, a newly endemic region." The Canadian Veterinary Journal 53.8 (2012): 870.
Other paper mentioned unusual presentation of alveolar echinococcosis in dogs which is a case report:
Geigy, Caroline A., et al. "Unusual presentation of alveolar echinococcosis as prostatic and paraprostatic cysts in a dog." BMC veterinary research 9.1 (2013): 1-5.
Dr. Raad,
Besides the two papers mentioned above, Oscos-Snowball and collaborators have recently published an article that again reported the role of the dog as an aberrant intermediate host for E. multilocularis.
Oscos-Snowball A, Tan E, Peregrine AS, Foster R, Bronsoiler J, Gottstein B, Jenkins E, Gesy K, Bienzle D., 2014, What is your diagnosis? Fluid aspirated from an abdominal mass in a dog. Vet Clin Pathol. doi: 10.1111/vcp.12210. [Epub ahead of print]
I have the pdf. If you need it, write me at [email protected]
I think there is no report of hydatic cyst infection in canines. Perhaps digested
Dear Dr. Raad,
There are few reports for cyst hydatid in cats. Links of these reports are below. As you know, there is no certainty in biology.
http://www.ncbi.nlm.nih.gov/pubmed/24291289
http://www.ncbi.nlm.nih.gov/pubmed/21929841
http://www.ncbi.nlm.nih.gov/pubmed/15605541
http://www.ncbi.nlm.nih.gov/pubmed/5623756
Dogs are the final host of Echinococcus granulosus and contain the adult parasite inside her intestines that develope by ingestion hydatid cysts that found in tissues of infected dead and slaughtered animals and birds so dogs cant be infected by eggs of the parasite because the environment of dog intestine isnt suitable to hexacanth embryo to still alive and penetrate intestine wall towards blood stream and formed hydatid cysts later..
It may happen but not common. There are reports showing dogs and foxes harboring both stages, hydatid cysts in the liver, and adults in the intestine. So, the life cycle may be completed by cannibalism of carnivors even though the major cylce is maintained the prey-predator interaction of the different animals of herbivors and/or omnivors and carnivors.
I have read some reports, I leave a link of a case report.
Article First case of peritoneal cystic echinococcosis in a domestic...
Normally , this will not occur in the definitive host.
Akira Ito Dear sir,
I also would like to ask a question. Could you please explain me how protoscoleces can be alive in gastric acid in canids ? if the protoscoleces are resistant to gastric acid, why don't they infect humans. Because human can be infect with only eggs of Echinococcus.
Some colleagues have pointed to a few reports of dogs infection with Echinococcus multilocalaris cyst.
I think there is difference between alveolar echonococosis and cystic echonococosis. Because the final host of the first parasite is the fox, so the dog may have some susceptibility toward it, while in cystic echonococosis the dog represent the final host here.
Also the eggs of the parasite may be digested in the dog's intestine when ingest it by the food.
The subject need more search.
Cases are rare in North America. The parasite is transmitted to dogs when they eat organs of other animals that contain hydatid cysts. Once ingested by canines, these cysts develop into adult tapeworms. Infected dogs shed tapeworm eggs in their feces, which contaminate the ground.
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