Dipylidium caninum (the double-pored dog tapeworm) mainly infects dogs and cats, but is occasionally found in humans.
Gravid proglottids are passed intact in the feces or emerge from the perianal region of the host . Subsequently they release typical egg packets . On rare occasions, proglottids rupture and egg packets are seen in stool samples. Following ingestion of an egg by the intermediate host (larval stages of the dog or cat flea Ctenocephalides spp.), an oncosphere is released into the flea’s intestine. The oncosphere penetrates the intestinal wall, invades the insect’s hemocoel (body cavity), and develops into a cysticercoid larva . The larva develops into an adult, and the adult flea harbours the infective cysticercoid . The vertebrate host becomes infected by ingesting the adult flea containing the cysticercoid . The dog is the principal definitive host for Dipylidium caninum. Other potential hosts include cats, foxes, and humans (mostly children) , . Humans acquire infection by ingesting the cysticercoid contaminated flea. This can be promulgated by close contact between children and their infected pets. In the small intestine of the vertebrate host the cysticercoid develops into the adult tapeworm which reaches maturity about 1 month after infection . The adult tapeworms (measuring up to 60 cm in length and 3 mm in width) reside in the small intestine of the host, where they each attach by their scolex. They produce proglottids (or segments) which have two genital pores (hence the name “double-pored” tapeworm). The proglottids mature, become gravid, detach from the tapeworm, and migrate to the anus or are passed in the stool .
Worldwide. Human infections have been reported in Europe, the Philippines, China, Japan, Argentina, and the United States.
Most infections with Dipylidium caninum are asymptomatic. Pets may exhibit behavior to relieve anal pruritis (such as scraping anal region across grass or carpeting). Mild gastrointestinal disturbances may occur. The most striking feature in animals and children consists of the passage of proglottids. These can be found in the perianal region, in the feces, on diapers, and occasionally on floor covering and furniture. The proglottids are motile when freshly passed and may be mistaken for maggots or fly larvae.
Dipylidium caninum egg packets in wet mounts.
Figure A: D. caninum egg packet, containing 8 visible eggs, in a wet mount.
Figure B: D. caninum egg packet in a wet mount.
Figure C: D. caninum egg packet in wet mount.
Figure D: D. caninum egg packet in wet mount.
Figure E: D. caninum egg packet in wet mount.
D. caninum eggs in wet mounts under conventional and differential interference contrast microscopy.
Figure A: D. caninum eggs clumped together in a wet mount. Image taken at 200x magnification.
Figure B: D. caninum eggs clumped together in a wet mount. Image taken at 400x magnification, hooklets in the some of the eggs are visible.
Figure C: D. caninum eggs clumped together under differential interference contrast microscopy (same eggs as in Image B).
Figure D: Close up of Image C. Note the visible hooklets in three of the eggs.
D. caninum proglottids.
Figure A: D. caninum proglottid under a dissecting microscope cleared with lactophenol.
Figure B: D. caninum proglottid.
Figure C: D. caninum proglottid partially cleared with lactophenol, showing eggs and egg packets.
Figure D: D. caninum proglottid. The genital pores are clearly visible in the carmine-stained proglottid.
Cross-section of a D. caninum proglottid stained with hematoxylin and eosin (H&E).
Figure A: Cross-section of a D. caninum proglottid stained with H&E. Image taken at 100x magnification.
Figure B: Cross-section of a D. caninum proglottid stained with H&E. Image taken at 200x magnfication.
Figure C: Cross-section of a D. caninum proglottid stained with H&E. Image taken at 400x magnification
Figure D: Cross-section of a D. caninum proglottid stained with H&E. Image taken at 1000x magnification.
D. caninum scolex.
Figure A: D. caninum scolex.
Adult tapeworm of D. caninum.
Figure A: Adult tapeworm of D. caninum. The scolex of the worm is very narrow and the proglottids, as they mature, get larger.
The diagnosis is made by demonstrating the typical proglottids or egg packets in the stool or the environment.
Treatment information for dipylidium can be found at: https://www.cdc.gov/parasites/dipylidium/health_professionals/index.html
DPDx is an education resource designed for health professionals and laboratory scientists. For an overview including prevention and control visit www.cdc.gov/parasites/.
- Page last reviewed: December 7, 2017
- Page last updated: December 7, 2017
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