Macrocolonies (Granules) Formation as a Cause of False-Negative Results in the MGIT 960 System: Cause Analysis and Correlation with Mycobacterial Species

Table 1

The drug susceptibility test outcomes of 18 MTC isolates with granules forming to four first-line antituberculosis drugs.

Antituberculosis drugs				Number of isolates
SM	INH	RIF	EMB
S	S	S	S	7
R	R	R	S	5
R	S	S	S	2
R	R	R	R	2
R	R	S	S	1
S	R	S	S	1

S: susceptible; R: resistant.