Microbiology Questions-3

3. An emaciated prisoner in a New York prison
began coughing up sputum streaked with
blood. Examination of the sputum revealed the
presence of acid-fast bacilli. Which of the following
would be least helpful in establishing a
diagnosis of tuberculosis?
(A) agglutination test for antibodies
(B) niacin production test
(C) nitrate reduction test
(D) rough, non-pigmented colonies
(E) slow growth on Lowenstein-Jensen
medium

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