שאלה משלב א׳ במיקרוביולוגיה קלינית · מועד 2022, שאלה 19

Correct: C — one does not aim for absolute absence of non-mycobacterial growth. Decontamination is a compromise: a contamination rate of a few per cent is accepted, because harsher treatment kills the mycobacteria too. Option A is true, skin specimens being incubated at 30 degrees as well for M. marinum, M. haemophilum and M. ulcerans; option B is true, Middlebrook formulations serving in MGIT, broth and agar; option D is true, specimens from sterile sites not requiring decontamination.