Table 2.

Antimicrobial resistance of S. Typhimurium isolates in Shanghai from 2011 to 2014.

	N (%) of resistant isolates
	2011 (N = 77)	2012 (N = 155)	2013 (N = 167)	2014 (N = 160)	Total (N = 559)
Pan-susceptible	4 (5.2)	8 (5.2)	4 (2.4)	10 (6.3)	26 (4.7)
Nalidixic Acid	67 (87)	107 (60)	145 (86.8)	124 (77.5)	443 (79.2)
Ciprofloxacin	7 (9.1)	4 (2.6)	6 (3.6)	3 (1.9)	20 (3.6)
Ampicillin	54 (70.1)	124 (80)	150 (89.8)	120 (75)	448 (80.1)
Ceftiofur	23 (29.9)	37 (23.9)	30 (18)	22 (13.8)	112 (20)
Cefoxitin	8 (10.4)	17 (10.3)	1 (0.6)	2 (3.8)	28 (5)
Ceftriaxone	23 (29.9)	37 (23.9)	30 (18)	22 (13.8)	112 (20)
Tetracycline	58 (75.3)	124 (80)	156 (93.4)	130 (81.3)	468 (83.7)
Streptomycin	33 (42.9)	74 (47.7)	97 (58.1)	96 (60)	300 (53.7)
Gentamicin	29 (37.7)	62 (40)	81 (48.5)	35 (21.9)	207 (37)
Chloramphenicol	31 (40.3)	86 (55.5)	124 (74.3)	66 (41.3)	307 (54.9)
Azithromycin	1 (1.3)	13 (8.4)	4 (2.4)	13 (8.1)	31 (5.5)
Sulfisoxazole	27 (35.1)	126 (81.3)	156 (93.4)	122 (76.3)	431 (77.1)
trimethoprim/sulfamethoxazole	31 (40.3)	76 (49)	97 (58.1)	61 (38.1)	265 (47.4)
amox-icillin/clavulanic acid	9 (11.7)	20 (12.9)	5 (3)	10 (6.3)	44 (7.9)
MDR pattern
≥3 antimicrobials	56 (72.7)	130 (83.9)	159 (95.2)	128 (80)	473 (84.6)
≥4 antimicrobials	51 (66.2)	121 (78.1)	147 (88)	116 (72.5)	435 (77.8)
≥5 antimicrobials	40 (51.9)	91 (58.7)	125 (74.9)	85 (53.1)	341 (61)
≥6 antimicrobials	25 (32.5)	52 (33.5)	91 (54.5)	47(29.4)	215 (38.5)
≥7 antimicrobials	1 (1.3)	0 (0)	1 (0.6)	4 (2.5)	6 (1.1)
ACSSuT	15 (19.5)	42 (27.1)	66 (39.5)	38 (23.8)	161 (28.8)
ACSSuT+CIP	5 (6.5)	6 (3.9)	18 (10.8)	11 (6.9)	40 (7.2)
ACSSuT+CEP	7 (9.1)	15 (9.7)	8 (4.8)	6 (3.8)	36 (6.4)
ACSSuT+AZI	1 (1.3)	2 (1.3)	1 (0.6)	6 (3.8)	10 (1.8)
ACSSuT+CIP+CEP	2 (2.6)	0 (0)	2 (1.2)	2 (1.3)	6 (1.1)
ACSSuT+CIP+CEP+AZI	1 (0.2)	0 (0)	0 (0)	0 (0)	1 (0.2)

CIP, Ciprofloxacin; CEP, cephalosporins; AZI, Azithromycin.