Table 3:

Organisms isolated from abscess fluid and blood cultures

Organism isolated	Fluid culture, no. of studies; n = 23	Fluid culture, no. of patients; n = 5,083	Blood culture, no. of studies; n = 9	Blood culture, no. of patients; n = 1,138
Klebsiella spp	15	2,758 (54.2)	9	666 (58.52)
Escherichia coli	22	594 (11.7)	8	143 (12.57)
Proteus spp	4	20 (0.39)	3	5 (0.44)
Enterobacter spp	5	12 (0.24)	2	3 (0.26)
Citrobacter spp	4	15 (0.3)	1	1 (0.09)
Pseudomonas spp	5	20 (0.39)	3	10 (0.88)
Other gram-negative aerobic organisms	5	45 (0.89)	4	22 (1.93)
Staphylococcus spp (not classified)	3	8 (0.16)	3	16 (1.41)
Staphylococcus aureus	2	6 (0.12)	2	15 (1.32)
Streptococcus spp (not classified)	8	99 (1.95)	5	20 (1.76)
Streptococcus milleri	4	57 (1.12)	2	11 (0.97)
Streptococcus anginosus	1	21 (0.41)	0	0
Enterococcus spp	10	63 (1.24)	6	22 (1.93)
Other gram-positive aerobic organisms	3	8 (0.16)	2	2 (0.18)
Anaerobic organisms	11	177 (3.48)	7	72 (6.33)
Polymicrobial	13	552 (10.86)	2	12 (1.0)
Other (not specified)	6	83 (1.63)	2	7 (0.62)
Culture negative or unknown	6	545 (10.72)	1	111 (9.75)