Strongyloides stercoralis threadworm Worldwide distribution Endemic in tropical
Strongyloides stercoralis - threadworm 糞小桿線蟲 World-wide distribution Endemic in tropical and subtropical countries
Trachea Lung Pharynx Swallowed Circulation Penetrates intestine Penetrates skin or perianal skin Filariform larva (L 3) L 3 Adult worms in mucosa of small intestine Eggs in mucosa Autoinfection Rhabditiform larva (L 1) in faeces Direct Development Free living adults in soil Rhabditiform larva (L 1) in soil Indirect Development Eggs in soil
Clinical Features 臨床徵候 Cutaneous 絲狀幼蟲穿透皮膚 Itchy dermmatitis皮膚炎, pruritus 搔癢症狀 and rash 紅腫 Pulmonary 幼蟲心肺移行 Allergic 過敏 and respiratory symptoms Haemorrhages in the lung alveoli, pneumonitis 肺炎 Intestinal 成蟲寄生腸道 Diarrhoea with blood and muscus 腹瀉, ulcerative enteritis 化膿性腸炎, anaemia 貧血, malabsorption 吸收不良 , steatorrhoea 脂肪便, epigastric pain 上腹部疼痛, electrolyte disturbance 電解質不平衡 and eosinophilia 嗜酸性白血球增加 Disseminated Hyperinfection Infection 擴散性感染 Infection can be found in almost all organs
Laboratory Diagnosis 實驗診斷 Finding rhabditiform larvae 桿狀幼蟲 in faeces (each gram of faeces contain about 1~3 larvae) Finding R-form larvae in duodenal aspirates 十二指腸抽取液 Examination of faeces for S. stercoralis Direct saline preparation 直接抹片 Formol ether concentration technique 糞便濃縮 Stool culture 糞便培養
- Slides: 8