שאלה משלב א׳ במיקרוביולוגיה קלינית · מועד 2022, שאלה 31

Correct: B — Campylobacter upsaliensis. A small curved Gram-negative rod that is oxidase positive but catalase negative, grows at 42 degrees, and fails on a cephalosporin-containing selective medium such as Campy-CVA, which inhibits it, is C. upsaliensis; it is the catalase-negative campylobacter and is isolated from blood in immunocompromised patients. Option A, C. coli, is catalase positive and grows on the selective medium; option C, Helicobacter pylori, does not grow from blood or at 42 degrees; option D, Vibrio vulnificus, is a straight oxidase-positive rod that grows on MacConkey.