1. Strogyloides stercoralis

2. -tropical regions. -fatal opportunistic pathogen. -female embedded in the mucosa. -females are parthenogenetic. -males. -stages. -habitat.

7. Clinical features A-Intestinal strongyloidiasis: 1-Acute: diarrhea, abdominal pain, nausea, vomiting, weight loss, GIT bleeding, pruritis ani. 2-Chronic: protein losing enteropathy, malabsorbtion, paralytic ileus.

8. b-Extraintestinal strongyloidiasis: 1-Pulmonary: Loffler's syndrome, cough, dyspnea, haemoptesis, eosinophilia. 2-Cutaneous: rash, pruritis, larva currens. 3-Neurological: infection of brain and meninges. 4-Other organs: liver, spleen, kidney, ovary, pancreas, heart, prostate, thyroid.

9. Causes of death a-Hyperinfection especially with pulmonary and cerebral involvement. 2-Bacteremia: bacteria enter along with the larvae. 3-Generalized peritonitis and paralytic ileus.

10. Diagnosis 1-symptoms of peptic ulcer and peripheral eosinophilia. 2-Direct stool examination: -active rhabditoiform larvea. -filariform larvae a day or more before examination of stool. -Adults worms are occasionally seen. 3-Concentrated method of stool: Bermann's method. 4-The larvae can detected insputum, urine, ascetic fluid and CSF in disseminated forms of infection. 5-Serological tests: ELISA, IFAT. 6-Eosinophilia in blood examination.

11. Treatment Thiabendazole. In severe cases of hyperinfection, the drug may need more period.