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6. False-negative Mantoux test is observed in

A. early tuberculosis
B. Advanced tuberculosis
C. Severe malnutrition
D. All of these

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7. Humans become infected with Mycobacterium tuberculosis most frequently by

A. inhalation
B. ingestion
C. contact
D. inoculation

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8. Rough and buff colonies on LJ medium are characteristic of

A. M chelonae
B. M bovis
C. Mycobacterium tuberculosis
D. M fortuitum

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9. Which of the following species of Mycobacterium is positive for nitrate reduction test?

A. M chelonae
B. M fortuitum
C. Mycobacterium tuberculosis
D. All of these

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10. The bacteria which is microaerophilic on primary isolation is

A. M fortuitum
B. Mycobacterium tuberculosis
C. M bovis
D. none of these

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