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Comparison of cycle threshold values of the GeneXpert MTB/RIF assay on stool preparations floated with sucrose and NaCl. Stool preparations were treated with the indicated concentrations of sucrose (A and C) or NaCl (B and D). Bacilli were allowed to float by gravity (A and B) or subjected to centrifugation (C and D). Symbols represent unique patient samples. Closed symbols represent the top volume of stool preparations, while open symbols represent the middle volume.
