Contamination of stored sputum AFB smears with environmental mycobacteria.

Abstract

To check the quality of stains and the acid-fast bacilli (AFB) staining procedure, a sample of 73 AFB-negative sputum smears selected systematically from a microscopy centre was rechecked before and after restaining with the same AFB staining method at a reference laboratory. Respectively 0 and 30 showed AFB before and after restaining. Detection of AFB… (More)

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