Question:
Which of the following is a liquid medium used for the culture of tuberculosis bacilli?
Which of the following is a liquid medium used for the culture of tuberculosis bacilli?
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Look for the automated broth based Middlebrook 7H9 system.
Updated On: Jun 24, 2026
- LJ medium
- Dorset medium
- Loeffler's medium
- MGIT
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The Correct Option is D
Solution and Explanation
Step 1: The question asks for a liquid culture medium for Mycobacterium tuberculosis. Most classical mycobacterial media are solid egg based media.
Step 2: MGIT stands for Mycobacterial Growth Indicator Tube. It is an automated liquid culture system containing about 7 ml of modified Middlebrook 7H9 broth base, and it detects growth by oxygen consumption using a fluorescent sensor. It is the liquid medium among the options.
Step 3: Lowenstein-Jensen (LJ) medium and Dorset egg medium are solid egg based media used for tuberculosis. Loeffler's serum slope is a solid medium used mainly for Corynebacterium diphtheriae, not for primary TB culture.
Step 4: Hence the correct answer is MGIT.
Step 2: MGIT stands for Mycobacterial Growth Indicator Tube. It is an automated liquid culture system containing about 7 ml of modified Middlebrook 7H9 broth base, and it detects growth by oxygen consumption using a fluorescent sensor. It is the liquid medium among the options.
Step 3: Lowenstein-Jensen (LJ) medium and Dorset egg medium are solid egg based media used for tuberculosis. Loeffler's serum slope is a solid medium used mainly for Corynebacterium diphtheriae, not for primary TB culture.
Step 4: Hence the correct answer is MGIT.
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