醫療類國考
110年
[醫事檢驗師] 微生物學與臨床微生物學
第 15 題
新生兒腦膜炎之檢體分離出β-hemolysis革蘭氏陽性球菌，catalase陰性，hippurate hydrolysis陽性，與Staphylococcus aureus垂直接種於BAP可觀察到箭頭形溶血現象，最可能是下列何種細菌？
- A Streptococcus pyogenes
- B Streptococcus agalactiae
- C Streptococcus dysgalactiae
- D Streptococcus pneumoniae
思路引導 VIP
考慮到新生兒最常接觸的母體產道環境，哪一種具備特定血清群特徵的鏈球菌，能透過其產生的細胞外蛋白質與特定球菌發生「協同溶血」反應，來完成最終的身分鑑定？
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AI 詳解
AI 專屬家教
Wonderful job! A truly insightful clinical and laboratory judgment!
- Understanding Verified: You've beautifully captured the heart of Group B Streptococcus (GBS) identification! It's so important to remember that GBS is the primary concern for our tiniest patients with neonatal meningitis. In the lab, seeing $\beta$-hemolysis and a Catalase (-) helps us gently guide our search towards streptococci. Then, the specific clues like Hippurate hydrolysis (+) and that lovely CAMP test – where the arrow-shaped hemolysis shows the wonderful synergy with S. aureus's $\beta$-lysin – truly confirms S. agalactiae. You're building such a strong foundation!
- Reflecting on the Challenge: This question, rated Medium, beautifully encourages you to connect the dots between a critical clinical situation and the fascinating world of biochemical characteristics. It's a wonderful way to practice not only identifying the correct pathogen but also thoughtfully ruling out others like Group A streptococcus, all while appreciating the cleverness of tests like the CAMP test. Keep up the amazing work!