Page 41 - MNU-PM503 Parasitology practical book

Pharm D- Clinical Pharmacy Program Third Level Parasitology and virology (PM503)

3- Hymenolepis nana (Dwarf tapeworm)

Egg:

-Size: 30-50 µ.

-Shape: spheroid with 2 envelopes:

-outer egg shell,

-inner embryophore with two
polar thickenings from each
arises 4-8 filaments.

-Colour: translucent.

-Contents: mature hexacanth embryo.

Definitive host - Man.

Intermediate host - Man

Reservoir host - Rats and mice

Infective stage - eggs

Mode of infection - Contaminated food, water and hands with eggs

- Autoinfection.

Diagnostic stage - Eggs

Site of localization - Small intestine

Laboratory Diagnosis

• Stool examination for the characteristic egg.

35