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Microbiology · Other parasites of interest

Dipylidium caninum !

  • Parasite
  • For completeness

A dog and cat tapeworm that passes to toddlers when they swallow a flea. Segments like rice grains show up in the nappy.

Updated 2026-11-01

Also called: dog tapeworm, flea tapeworm, dipylidiasis

At a glance

Family
Dipylidiidae
Type
Cestode (tapeworm)
Size
Adult tens of centimetres long; gravid proglottids about a centimetre

Morphology

  • Proglottids with two genital pores, one on each side: the feature that gives it its name.
  • Fresh segments are motile and shaped like pumpkin or cucumber seeds; dried, they look like rice grains.
  • Eggs grouped in packets (egg capsules) of several eggs, each with a six-hooked embryo.

Transmission

  • Accidental swallowing of a dog or cat flea (Ctenocephalides) carrying the cysticercoid larva.
  • Most frequent in toddlers who play with flea-infested pets; not spread from person to person.

Reservoir: Dogs and cats

Isolation precautions

What the care team adds to standard precautions.

  • Standard

Life cycle

  1. The dog or cat sheds gravid proglottids in faeces or through the anus.
  2. Flea larvae eat the eggs in the environment.
  3. The cysticercoid larva develops inside the flea as the flea matures.
  4. The pet (or a child) swallows the infected adult flea.
  5. In the small intestine the larva attaches and grows into an adult tapeworm within weeks.

Virulence factors

  • It attaches to the mucosa with a hooked scolex and causes little damage.
  • Segments leaving through the anus cause perianal itch.

Diseases it causes

  • Dipylidiasis: an almost always mild intestinal infection in children

Clinical picture

  • Usually asymptomatic; parents see motile segments in the nappy or clothes, sometimes mistaken for maggots.
  • Anal itch, mild digestive upset.

Diagnosis

  • Identifying proglottids with two genital pores or egg packets in stool or the nappy.
  • Flotation can miss them because the egg packets are heavy.

Treatment

Anthelmintic against cestodes: praziquantel. The pet must also be treated and its fleas controlled to prevent reinfection.

Drug class only; doses and regimens are set by the clinician from the current guideline.

In Pharmacology:

Prevention

  • Flea control and regular deworming of dogs and cats.
  • Children's handwashing after playing with animals.

Test yourself

Think of the answer, then tap the question to see it.

How does a child become infected with Dipylidium caninum?

By accidentally swallowing a dog or cat flea that carries the cysticercoid larva.

Which proglottid feature identifies Dipylidium?

It has two genital pores, one on each side of the segment.

What do parents see in dipylidiasis?

Whitish segments moving in the nappy or stool that, once dry, look like rice grains.

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Educational content on microorganisms; not a treatment guide and no substitute for a health professional's advice. No doses are given.

Sources: CDC - DPDx - Dipylidium caninum (CDC, 2024); Parasitosis humanas (Botero y Restrepo), 5.ª ed. (Corporación para Investigaciones Biológicas (CIB), 2012).

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Representative model, for educational purposes only.