Atlas of livestock parasites
digitized collection of microscopical preparations

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Diphyllobothrium latum



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"broad fish tapeworm"

Dogs and cats can also be infected with D. dendriticum.

Distribution: Northern Hemisphere and South America.  

Host: Small intestine of dogs, cats, pigs, humans, and various other fsh-eating  mammals.         

Life Cycle: Eggs passed in the feces of the fnal host hatch coracidia, which are ingested by fresh-water copepods (frst intermediate hosts). Fish eat the copepods containing the next larval stage       (procercoids), which develop into the plerocercoids (infective stage) in the fsh. Predatory fish can acquire plerocercoids through ingestion of infected smaller fsh. Mammalian defnitive hosts acquire infections through the ingestion of plerocercoids contained in the tissues of fsh.  

Diagnosis: The eggs can be detected in feces using a sedimentation technique. Lengths  of reproductively spent segments are occasionally passed in the feces.             

Size: Eggs 58–76 × 40–51 µm     

Clinical features: Infections are generally subclinical in dogs and cats. Dogs and cats do not serve as direct sources of infection for humans. Human infection with this tapeworm may lead to the development of vitamin B  defciency.    


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