As a parasite, Dipylidium caninum lives in a number of hosts. First, the eggs of Dipylidium caninum are excreted in the feces of the definitive host.

http://ct.gov/caes/cwp/view.asp?a=2815&q=376710Then it's intermediate hosts including the dog-flea, Ctenocephalides canis, the cat-flea, Ctenocephalides felis, the dog louse, Trichodecte canis, and in some scarce occasions the human-flea, Pulex irritans aquire the cysticercoid of Dipylidium caninum by eating the infected feces.  

Next the flea may infect a set of hosts including mainly dogs, cats,http://www.muttigrees.org/?q=blog foxes and in some cases, humans via ingestion of the flea host. By this time, Dipylidium caninum is in the final host's small intestines where it grows from it's larval worm stage of it's life cycle to an adult.

 Learn more and find a visual diagram of Dipylidium caninum's life cycle here.

The overall geographical distribution of Dipylidium caninum is worldwide. Moreover, human infections have been most evident in Europe, China, the Philippines, Japan, Argentina, and here in the United States.

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