TABLE 1.

Range of MICs of enrofloxacin for prevalent nalidixic acid-resistant serotypes

Year	Salmonella Typhimurium			Salmonella Hadar			Salmonella Paratyphi B (d-tartrate positive)			Salmonella Saintpaul
	No.	No. (%) NALra	ENRb MIC range (μg/ml)	No.	No. (%) NALr	ENR MIC range (μg/ml)	No.	No. (%) NALr	ENR MIC range (μg/ml)	No.	No. (%) NALr	ENR MIC range (μg/ml)
1986	463	2 (0.4)	NDc	14	0		17	0		56	0
1987	467	1 (0.2)	ND	36	0		6	0		42	2 (4.8)	ND
1988	931	28 (3.0)	0.5–128	24	0		9	0		36	0
1989	1,156	113 (9.8)	0.5–128	39	0		4	0		20	1 (5.0)	ND
1990	906	338 (37.3)	0.5–128	37	3 (8.1)	ND	3	0		25	1 (4.0)	ND
1991	220	28 (12.7)	0.5–128	45	3 (6.7)	0.5–1	0	0		14	3 (21.4)	0.5
1992	189	33 (17.5)	0.5–128	34	6 (17.6)	0.5–2	2	0		17	2 (11.8)	0.5–1
1993	285	17 (6.0)	1–128	22	5 (22.7)	1–2	2	0		25	5 (20.0)	0.5–1
1994	200	2 (1.0)	1–128	72	61 (84.7)	0.5–4	3	1 (33.3)	0.5	13	5 (38.5)	0.5–1
1995	675	13 (1.9)	0.5–128	95	64 (67.4)	1–4	6	2 (33.3)	0.5–1	35	14 (40.0)	0.5–1
1996	670	16 (2.4)	0.5–128	54	41 (75.9)	1–4	15	11 (73.3)	1–2	14	5 (35.7)	0.5–1
1997	569	3 (0.5)	1–2	83	52 (62.7)	1–8	42	24 (57.1)	0.5–4	68	9 (13.2)	0.5–2
1998d	772	8 (1.0)	0.5–1	74	18 (24.3)	1–2	20	11 (55.0)	1–4	20	6 (30.0)	0.5–2

^aNAL^r, nalidixic acid resistant. 

^bENR, enrofloxacin. 

^cND, not determined. 

^dOnly strains received from January 1998 to October 1998 were investigated.