Table 5. Percentages of resistance of all clinical isolated bacteria to five antibiotics of the β-lactam group (%).

Bacteria	Amoxyclav 30 µg/disc			Ampicillin 10 µg/disc			Oxacillin 1 µg/disc			Piperacillin 100 µg/disc			Piperacillin/tazobactam 100/10 µg/disc
	1 st phase	2 nd phase	3 rd phase	1 st phase	2 nd phase	3 rd phase	1 st phase	2 nd phase	3 rd phase	1 st phase	2 nd phase	3 rd phase	1 st phase	2 nd phase	3 rd phase
E. faecalis	62	67	70	52	68	69	56	61	64	51	57	65	57	65	76
S. aureus	71	77	82	68	74	76	45	58	74	48	54	59	58	79	85
A. baumannii	55	62	67	69	77	59	-	-	-	47	52	51	62	57	64
Citrobacter sp.	25	31	40	32	37	44	-	-	-	25	24	28	33	39	46
E. aerogenes	52	61	72	65	69	75	-	-	-	45	52	61	52	61	63
E. coli	78	82	89	62	71	78	-	-	-	72	78	81	74	79	78
K. pneumoniae	54	67	76	74	79	83	-	-	-	55	61	67	51	59	62
K. oxytoca	35	34	38	33	39	46	-	-	-	27	31	35	37	34	35
P. mirabilis	15	22	31	32	41	43	-	-	-	34	39	42	34	43	45
P. vulgaris	42	38	41	34	39	48	-	-	-	25	34	41	35	37	43
P. aeruginosa	65	71	77	51	54	61	-	-	-	56	69	71	49	61	68

1st phase: April-September 2011; 2nd phase: October 2011-March 2012; 3rd phase: April-September 2012; -: not used, as oxacillin is not used for Gram-negatives.