病原第一次测试病原第一次测试.docx

1. 关于荚膜，下列说法错误的是(2.0分)A.与细菌的致病性有关 B.处于细菌细胞的最外层 C.可抵抗有害物质的作用 D.与细菌的黏附无关2. CASE: A 13-year-old girl was admitted to a healthcare facility with a 5-hour history of diarrhea(腹泻) and vomiting（呕吐）. On patient interview, the physician suspected it to be an infection by contaminated food. The physician recommended diagnostic tests to be done for the patient. Microscopic examination of the stool on Gram staining revealed Gram negative bacilli. The microbiologist discovered short, slender（瘦长的） rods during microscopic examination and suspected the organism to be Escherichia coli. Which among the following media helps in differentiating E. coli from other genera of enteric bacteria? (2.0分)A.Sheep blood agar (SBA) B. Eosin methylene blue (EMB) agar C. Chocolate agar plate D. Liquid media3. The antibiotic recommended by Centers for Disease Control (CDC) for treatment of gonorrhea （淋病）is(2.0分)A. Penicillin B. Ceftriaxone （头孢曲松）C. Erythromycin （红霉素）D. Tetracycline （四环素）E. Aminoglycosides（氨基糖甙类）4. An elderly woman was admitted to the hospital for a septic wound treatment on her lower abdomen which developed after a colon operation. Her wound was 1.5-cm open, and oozing（渗出） a yellow exudate（分泌液）. Which is the best way of sterilizing（消毒） the sheet of the bed（床单） contaminated with the septic wounds secretion?(2.0分)A. Using anionic agent solvents （阴离子溶剂）B. Using nonionic agent solvents （非离子型表面活性剂的溶剂）C. Dry heat sterilization （干热灭菌）D. Autoclave sterilization （湿热灭菌）E. Radiation（辐射）5. 1. A Gram stain has been performed on a bacterial isolate taken from a sheep blood agar plate. Upon observation, the cells appear to be red to pink rods. The organism is presumptively identified as Citrobacter koseri (克氏柠檬酸杆菌) . The most likely reason for the red color of the cells in the stain is that the (2.0分)A. Peptidoglycan（肽聚糖） layer of the cell wall is relatively thin B. Peptidoglycan layer of the cell wall is relatively thick C. Organisms in this genus have a lipopolysaccharide（脂多糖） outer membrane D.O