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Dipylidium caninum Infection

By

Richard D. Pearson

, MD, University of Virginia School of Medicine

Last full review/revision Mar 2020| Content last modified Mar 2020
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Dipylidium caninum is a tapeworm that can cause intestinal infection in humans, which is typically asymptomatic.

D. caninum, the double-pored tapeworm, is present in dogs and cats. Fleas are the intermediate host. Ingestion of an infected flea, usually by a young child, causes an asymptomatic, self-limited infection, but proglottids (tapeworm segments) may be seen in stool.

Treatment is with a single oral dose of praziquantel 5 to 10 mg/kg. Alternatively, a single 2-g dose of niclosamide (unavailable in the US) is given as 4 tablets (500 mg each) that are chewed one at a time and swallowed. For children, the dose is 50 mg/kg (maximum 2 g) once. The infection is self-limited in humans and usually resolves spontaneously in 6 weeks.

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Toxoplasmosis
Toxoplasmosis is infection with Toxoplasma gondii. The only known hosts of this organism are domestic cats and their relatives. Infection with T. gondii in humans can occur in various ways. Which of the following is the most common mode of infection in humans? 
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