Fig. 1From: Preservation of sputum samples with cetylpyridinium chloride (CPC) for tuberculosis cultures and Xpert MTB/RIF in a low-income countryOverview of sputum sample processing. Cetylpyridinium chloride (CPC); Difco buffer, Difco neutralizing buffer; RT, room temperature; TB, tuberculosis; ZN, Ziehl-Nielsen staining. 1 1% NaOH decontaminationBack to article page