Table 3.

Antimicrobial in vitro susceptibility data for the most common bacterial isolates (susceptibility determined using the Clinical and Laboratory Standards Institute [CLSI] breakpoints for veterinary pathogens [6]). Numbers refer to the percentage of isolates classified as sensitive to the appropriate antibiotic

Isolate	Number of isolates	Amp	Cef	Ceph	Enro	Gen	Neo	Pen	Tet	TMS	Ery	Co-Am	Ami	Spec
Streptococcus zooepidemicus	221	92	99	99	91	85	20	95	59	55	91	87	5	87
Escherichia coli	82	62	94	50	91	80	61	0	65	62	6	84	100	81
Actinobacillus suis	69	87	100	99	99	70	30	59	91	96	25	100	38	48
Streptococcus spp. (α-hem)	45	89	100	100	86	89	53	89	93	75	89	83	55	100
Actinobacillus equuli	44	91	98	100	100	79	47	67	93	93	39	100	46	40
Enterobacter spp.	42	37	88	29	98	88	67	3	62	79	7	71	96	56
Staphylococcus aureus	36	55	97	100	97	100	83	55	97	100	84	94	100	29
Enterococcus spp.	28	96	29	36	46	75	33	86	64	68	50	100	25	67
Staphylococcus spp.	29	52	90	97	93	86	93	48	79	86	86	93	100	69
Streptococcus equi	22	100	100	100	95	95	0	100	92	79	100	100	0	100
Pseudomonas spp.	25	24	33	16	68	64	47	16	40	52	8	63	100	33
Pseudomonas aeruginosa	26	0	0	0	30	56	13	0	0	0	0	13	92	7
Actinobacillus spp.	22	95	95	95	100	73	25	68	91	95	14	91	33	18
Pasteurella spp.	17	94	100	100	100	100	100	72	100	100	67	100	67	100

Amp — Ampicillin; Cef — ceftiofur; Ceph — cephalothin; Enro — enrofloxacin; Neo — neomycin; Pen — penicillin; Tet — tetracycline; TMS — trimethoprim sulfa; Ery — erythromycin; Co-Am — Co-amoxyclav; Ami — Amikacin; Spec — spectinomycin