Reprocessing of Contaminated MGIT 960 Cultures to Improve Availability of Valid Results for Mycobacteria

Table 1

Effect of reprocessing of the contaminated mycobacterial liquid culture.

	Before reprocessing	After reprocessing	% difference	value
Contamination	106 (13.4%)	54 (6.8%)	6.60	<0.001
Positive for the MTB complex	362 (45.6%)	384 (48.4%)	2.80	0.286
Nontuberculous mycobacteria (NTM)	29 (3.7%)	32 (4.0%)	0.30	0.857
Negatives	296 (37.3%)	323 (40.7%)	3.40	0.181
Total	793
Valid results^@	687 (86.6%)	739 (93.2%)	6.60	<0.001

^@Cumulative number of cultures yielding MTB complex, NTM, and negatives.