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  5. 台灣孕婦產前篩檢之無乳鏈球菌的莢膜基因分型
 
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台灣孕婦產前篩檢之無乳鏈球菌的莢膜基因分型

Other Title
Capsular Genotyping of Streptococcus agalactiae in Prenatal Screening in Taiwan
Type
thesis
Date Issued
2017-01-06
Author(s)
吳文琦
Advisor
吳雪霞
Subjects
系所名稱:醫學檢驗暨生物技術學系所
Description
學位別:碩士
語文別:中文
指導教授:吳雪霞
口試委員:劉俊仁;謝文祥
中文關鍵字:無乳鏈球菌;乙型鏈球菌
英文關鍵字:Streptococcus agalactiae;GBS
Abstract
無乳鏈球菌(Streptococcus agalactiae),簡稱GBS,為造成新生兒感染早發性疾病(early-onset disease;EOD)以及遲發性疾病(late-onset disease;LOD)的致病原,並經常造成免疫力低下、糖尿病、癌症患者的侵襲性感染。GBS造成的新生兒疾病在無產前抗生素的預防之下,致死率大於55%,若造成成人的侵襲性疾病也會有很高的病死率。目前推廣的產前抗生素預防(Intrapartum antibiotic prophylaxis; IAP),雖已將新生兒感染EOD致死率降至5%,但IAP的實施無法預防早產兒的感染,以及新生兒出生之後LOD的感染,加上抗生素頻繁的使用導致抗藥性菌株日益上升,GBS疫苗的發展是現在最重要的目標。疫苗的發展,目前已經進入臨床試驗第二期的疫苗標的物為GBS最重要的毒力因子莢膜多醣體(capsular polysaccharide; CPS),而GBS CPS serotype目前已發現十型,Ia、Ib、II-IX。現在的疫苗CRM197- conjugated group B streptococcal vaccine Trivalent Vaccine為針對Ia、Ib、III所開發。本研究發現台灣的GBS CPS serotype最多為serotype III (25.4 %),第二位serotype VI (23.7 %),第三位serotype V (14.5 %),未來若是使用歐美藥廠所開發針對serotype Ia、Ib、III的疫苗,則台灣有一半的孕婦是無法產生保護力。這次的研究並發現台灣GBS的抗藥性菌株已有48.8%,尤其是serotype Ib抗藥性接近百分之百,代表台灣必須積極開發屬於台灣特有的GBS疫苗,或是開發疫苗標的物屬於GBS共有的蛋白質,才能夠在未來全面保障孕婦以及新生兒的安全,並減少因為抗生素的使用而產生的抗藥性菌株。
URI
https://203.71.86.71/handle/123456789/57954

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