Page 53 - MNU-PM503 Parasitology practical book

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

7- Strongyloides stercoralis

Microfilaria:

- Males grow to only about 0.9 mm in length,
females can grow from 2.0 to 2.5 mm (0.08
to 0.10 in).

- Both sexes also possess a tiny buccal
capsule and cylindrical esophagus without a
posterior bulb.

- In the free-living stage, the esophagi of both
sexes are rhabditiform. Males can be
distinguished from females by two

structures: the spicules and gubernaculum.

Definitive host - Man.
Infective stage - Infective filariform larvae

Mode of infection - Contact with soil that is contaminated with free-

living larvae
- Auto-infection.

- rare cases of person-to-person transmission in:

❖ Organ transplantation
❖ Institutions for the developmentally disabled

❖ Long-term care facilities
❖ Day care centers.

Diagnostic stage - Rhabditiform larvae.

Site of localization - Small intestine

Laboratory diagnosis:

A-Stool examination by:

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