Phenotypic antimicrobial resistance in Escherichia coli strains isolated from swine husbandries in North Western Germany – temporal patterns in samples from laboratory practice from 2006 to 2017

Table 9 Temporal development in AMR for ampicillin

	Number of isolates with MIC values (mg/ml) of…												S		I		R
	0.25	0.5	1	2	4	8	16	32	64	n	MIC ₅₀	MIC ₉₀	n	%	n	%	n	%
Year
2006	.	2	15	46	13	2	1	1	230	310	64	64	78	25.16	1	0.32	231	74.52
2007	.	.	7	55	29	4	.	4	282	381	64	64	95	24.93	.	.	286	75.07
2008	.	.	2	50	30	7	1	.	219	309	64	64	89	28.80	1	0.32	219	70.87
2009	.	.	4	28	33	6	1	1	197	270	64	64	71	26.30	1	0.37	198	73.33
2010	.	.	5	32	30	1	.	1	201	270	64	64	68	25.19	.	.	202	74.81
2011	.	.	10	33	13	.	1	.	209	266	64	64	56	21.05	1	0.38	209	78.57
2012	.	.	1	35	27	4	1	2	191	261	64	64	67	25.67	1	0.38	193	73.95
2013	.	.	2	19	42	5	.	1	227	296	64	64	68	22.97	.	.	228	77.03
2014	1	.	4	23	22	3	1	3	149	206	64	64	53	25.73	1	0.49	152	73.79
2015	.	.	1	17	24	2	1	.	149	194	64	64	44	22.68	1	0.52	149	76.80
2016	.	.	2	27	19	3	1	1	114	167	64	64	51	30.54	1	0.60	115	68.86
2017	.	.	.	25	16	1	.	1	81	124	64	64	42	33.87	.	.	82	66.13
Total	1	2	53	390	298	38	8	15	2249	3054	64	64	782	25.61	8	0.26	2264	74.13

ISSN: 1746-6148