TABLE 2.

Frequency of rpoB mutations in 66 rifampin-resistant M. tuberculosis isolates from four regions

Position of mutation	No. (%) of isolates with substitution
	China (n = 25)	Japan (n = 3)	Korea (n = 18)	Taiwan (n = 20)
Gln-513	4 (16.0)
514-Phe ins.a				1 (5.0)
Asp-516	4 (16.0)		4 (22.2)	3 (15.0)
His-526	1 (4.0)	1 (33.3)	3 (16.7)	2 (10.0)
Ser-531	14 (56.0)	2 (66.7)	10 (55.6)	8 (40.0)
Leu-533				2 (10.0)
None	2 (8.0)		1 (5.6)	4 (20.0)

^aPhenylalanine insertion.