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___ for acid-fast bacilli can serve as the surrogate marker for infectivity for tuberculosis

Patients with 3 negative smears are considered ___

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Final answer:

The presence of acid-fast bacilli is the surrogate marker for infectivity for tuberculosis. Patients with three negative smears are considered non-infectious for tuberculosis.

Step-by-step explanation:

The surrogate marker for infectivity for tuberculosis is the presence of acid-fast bacilli. Acid-fast bacteria can be detected through microscopy, specifically using the Ziehl-Neelsen staining technique. If a patient has three negative smears, they are considered non-infectious for tuberculosis.

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