一種B群鏈球菌臨床檢測方法的研制
本文選題:B群鏈球菌 + 圍產(chǎn)期婦女; 參考:《鄭州大學》2016年碩士論文
【摘要】:B群鏈球菌(group B streptococcus,GBS)是一類寄生于人類泌尿生殖道及下消化道的細菌,會導致孕婦流產(chǎn)、胎膜早破等臨床癥狀,此外,也能導致新生兒患敗血癥、肺炎、腦膜炎等疾病。準確快速地檢測和鑒別孕產(chǎn)婦感染B群鏈球菌的情況具有重要的臨床意義。檢測B群鏈球菌所使用的標本為陰道分泌物,分離檢測和鑒別用時較長,檢測手續(xù)繁瑣、精度低,目前臨床上急需一種準確快速的檢測方法。B群鏈球菌顯色培養(yǎng)基在國際已有相關研究,但國內(nèi)尚未見報道。進口產(chǎn)品價格昂貴、轉運周期較長、保存要求高,進而影響其在國內(nèi)的普遍推廣和使用。本論文采用特異性酶底物顯色技術,研制一種B群鏈球菌臨床檢測方法,以期獲得快速準確的檢測結果。研制方法和步驟主要為:以營養(yǎng)瓊脂培養(yǎng)基為基礎,后通過補加營養(yǎng)物質和生長因子,以靈敏度和特異性標準菌株的生長情況為指標,篩選出培養(yǎng)基的基礎配方,再結合特異性酶顯色底物等,通過一系列優(yōu)化試驗和正交試驗,篩選出B群鏈球菌顯色培養(yǎng)基的最佳配方;最后分別用20株臨床分離的B群鏈球菌和200份臨床疑似標本,以科馬嘉B群鏈球菌顯色培養(yǎng)基為對照,評價該配方培養(yǎng)基的性能。結果表明:1)通過對基礎培養(yǎng)基和顯色培養(yǎng)基的研制和優(yōu)化,確定B群鏈球菌顯色培養(yǎng)基的主要成分,即瓊脂粉、蛋白胨、酵母浸粉、牛心浸粉、海藻糖、特異性酶顯色底物、多粘菌素B、兩性霉素B、慶大酶素、吐溫80、氯化高鐵血紅素等,p H值為7.5;2)采用臨床分離的B群鏈球菌菌株,與科馬嘉顯色培養(yǎng)基對比,二者檢出率均為100%;3)在對臨床疑似標本檢測中,本品性能優(yōu)于科馬嘉顯色培養(yǎng)基檢測方法,科馬嘉的檢測靈敏度為85.8%,特異性為92.3%,而本品的兩項指標均為100%。Vitek2 System鑒定系統(tǒng)檢測結果支持本品的結論。本論文采用特異性酶顯色底物技術,研制的B群鏈球菌臨床檢測方法可獲得快速準確的檢測結果,且性能優(yōu)于法國科馬嘉的同類產(chǎn)品,可用于臨床檢測。
[Abstract]:Group B Streptococcus (group B Streptococcus (GBS)) is a class of bacteria parasitic on the human urogenital tract and the lower digestive tract. It can cause pregnant women to abort, premature rupture of membranes and other clinical symptoms, in addition, it can also cause neonatal sepsis, pneumonia, meningitis and other diseases. Accurate and rapid detection and identification of pregnant and lying in and lying in women with group B Streptococcus are heavy. Clinical significance. Detection of group B Streptococcus specimens for vaginal secretions, separation detection and identification used longer, tedious procedures, low accuracy, the clinical need for an accurate and rapid detection method.B group streptococcus color culture medium has been related research in the world, but there is no report at home. The price of imported products is expensive, In this paper, a specific enzyme substrate chromogenic technique is used to develop a clinical detection method of group B Streptococcus, in order to obtain rapid and accurate detection results. The methods and steps are mainly based on the nutrient agar medium and then by supplementing camp. Material and growth factors were used to screen out the basic formula of the medium and the specific enzyme chromogenic substrate. The best formula of group B streptococcal color culture medium was screened out by a series of optimization tests and orthogonal experiments. Finally, 20 B group streptococci were used to separate the clinical isolates of Streptococcus. The bacteria and 200 clinically suspected specimens were compared with the chromogenic medium of group B Streptococcus. The results showed that: 1) the main components of the color culture medium of group B Streptococcus, namely, agar powder, peptone, yeast extract, cow heart dipping powder, trehalose, were determined by the development and optimization of the basic culture medium and color culture medium. The specific enzyme chromogenic substrate, polymyxin B, amphotericin B, Qing Da enzyme, Twain 80, high hemin chlorination, P H value 7.5; 2) the clinical isolation of group B Streptococcus, compared with the Colma coloured culture medium of the Colma color culture, the two detection rates were 100%; 3) in the detection of the suspected specimen of the bed, the quality of this product was superior to the Colma coloration culture basis. The sensitivity of the test was 85.8% and the specificity was 92.3%. The two indexes of this product were all the results of the 100%.Vitek2 System identification system. This paper uses the specific enzyme chromogenic substrate technology to develop the clinical detection method of group B Streptococcus, and the performance is better than the method. Congener's similar products can be used for clinical testing.
【學位授予單位】:鄭州大學
【學位級別】:碩士
【學位授予年份】:2016
【分類號】:R446.5
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