Table 4.

Clusters identified in MDR-TB isolates from 140 patients from California and 34 from Texas

Clusters	Location	Isolates n	Lineage	rpoA mutations	rpoC mutations	rpoB mutations
1	California	3	East-Asian	None	G332T in 1	S531L
					F452L in 2	S531L
2	California	4	Euro-American	None	wt in 4	S531L
3	California	4	East-Asian	None	wt in 4	S531L
4	California	4	East-Asian	None	wt in 4	H526D
5	California	2	East-Asian	None	wt in 2	S531L
6	Texas	2	Euro-American	None	wt in 2	S531L
7	Texas	2	Euro-American	None	A466V and L507V in 1; wt in 1	H526D
8	Texas	2	East-Asian	None	wt in 2	S531L

MDR-TB = multidrug-resistant tuberculosis; wt = wild-type.