Newport has mentioned that the Hymenolepis Nana lives on bile- and can block the bile ducts.

Found more information on both the Hymenolepis Nana and Hymenolepis Diminuta, and videos.
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HYMENOLEPIS DIMINUTA
Centers for Disease Control and Prevention: Division of Parasitic Diseases
Hymenolepis Infection
Disease Overview: Institutional Animal Care and Use Committee, University of California, Santa Barbara.

(Rat Tapeworm Infection)

AGENT:
Hymenolepis diminuta is the common tapeworm of rodents. Size varies from 100-600 mm.
RESERVOIR AND INCIDENCE
Rodents, many arthropods (fleas, beetles, and cockroaches) serve as intermediate hosts.
TRANSMISSION:
Rodents and humans are infected by accidentally swallowing the infected arthropods, usually in cereals or stored products.
DISEASE IN ANIMALS:
Mild catarrhal enteritis with diarrhea occurs if the infection is heavy.
DISEASE IN MAN:
Light infections are generally asymptomatic. Heavy infections may cause diarrhea, abdominal pain, anorexia, vomiting, weight loss, and irritability, particularly in young children.
DIAGNOSIS:
Infections are diagnosed by finding characteristic eggs in feces; proglottids are usually not seen.
TREATMENT:
Niclosamide or praziquantel.
PREVENTION/CONTROL:
Eliminate rodents and insects in facilities.
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HYMENOLEPIS NANA
Disease Overview: Institutional Animal Care and Use Committee, University of California, Santa Barbara.
AGENT:
Dwarf tapeworm, Hymenolepis nana - measures 5-90 mm long.
RESERVOIRS AND INCIDENCE:
The animal reservoir is the house mouse, but humans can be both definitive and intermediate hosts. Worldwide occurrence in warm climates.
TRANSMISSION:
Gravid proglottids disintegrate and eggs pass in the feces and may be ingested by another human. Larvae then develop in the intestinal villi and pass to the lumen of the gut to become the adult forms. Dogs, cats and their fleas can be infected as well as grain beetles which can serve as intermediate hosts.
DISEASE IN ANIMALS:
Same as H. diminuta.
DISEASE IN MAN:
Same as H. diminuta.
DIAGNOSIS:
Same as H. diminuta.
TREATMENT:
Same as H. diminuta.
PREVENTION/CONTROL:
Personal hygiene, protective clothing and gloves Vermin control. Protect stored grains and feeds from grain beetles.
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