TABLE 2.

Distribution of aacA4 and 16S rRNA methylase genes among the 218 amikacin-resistant isolates of Enterobacteriaceae that were collected from a university hospital in South Korea

Yr of isolation	No. of strains carrying the following gene(s):						Total
	aacA4 alone	armA alone	armA and aacA4	rmtB alone	rmtB and aacA4	Nonea
1995	2						2
1996	9						9
1997	1	7	2				10
1998	1	3	1				5
2001		4		2	5		11
2002		1		5			6
2003			9				9
2004		19	6	1			26
2005		45	8	20	1	1	75
2006		24	24	17			65
Total no. of strains	13	103	50	45	6	1	218

^aNo gene was detected.