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 8 Temporal development in AMR for tetracycline

	Number of isolates with MIC values (mg/ml) of…											S		I		R
	0.25	0.5	1	2	4	8	16	32	n	MIC₅₀	MIC₉₀	n	%	n	%	n	%
Year
2006	.	26	.	20	2	1	1	260	310	32.00	32.00	48	15.48	1	0.32	261	84.19
2007	.	20	.	38	2	1	.	320	381	32.00	32.00	60	15.75	1	0.26	320	83.99
2008	.	8	.	37	8	1	3	252	309	32.00	32.00	53	17.15	1	0.32	255	82.52
2009	.	3	.	43	6	2	2	214	270	32.00	32.00	52	19.26	2	0.74	216	80.00
2010	.	5	.	35	7	1	2	220	270	32.00	32.00	47	17.41	1	0.37	222	82.22
2011	.	21	.	21	4	2	1	217	266	32.00	32.00	46	17.29	2	0.75	218	81.95
2012	.	9	.	52	8	.	.	192	261	32.00	32.00	69	26.44	.	.	192	73.56
2013	.	18	.	53	4	2	2	217	296	32.00	32.00	75	25.34	2	0.68	219	73.99
2014	1	5	17	41	4	1	.	137	206	32.00	32.00	68	33.01	1	0.49	137	66.50
2015	1	.	5	46	1	1	.	140	194	32.00	32.00	53	27.32	1	0.52	140	72.16
2016	.	.	7	39	2	.	1	118	167	32.00	32.00	48	28.74	.	.	119	71.26
2017	.	.	13	36	.	.	51	24	124	16.00	32.00	49	39.52	.	.	75	60.48
Total	2	115	42	461	48	12	63	2311	3054	32.00	32.00	668	21.87	12	0.39	2374	77.73

ISSN: 1746-6148