. 2011 Dec;49(12):4047–4051. doi: 10.1128/JCM.01314-11

Table 3.

Rank order of microorganisms/microorganism groups most frequently isolated from blood

Rank	Isolated organism or group by study period^a
Rank	2006-2008^b	1996-1997^c	1989-1992^d	1984-1988^d
1	Staphylococcus aureus	Staphylococcus aureus	Staphylococcus aureus	Staphylococcus aureus
2	Escherichia coli	Escherichia coli	Escherichia coli	Escherichia coli
3	Klebsiella pneumoniae complex	CoNS	CoNS	Candida albicans
4	Enterococcus species	Enterococcus species	Candida albicans	CoNS
5	CoNS	Candida albicans	Enterococcus species	Pseudomonas aeruginosa
6	Pseudomonas aeruginosa	Pseudomonas aeruginosa	Pseudomonas aeruginosa	Enterococcus species
7	Streptococcus pneumoniae	Klebsiella pneumoniae	Klebsiella pneumoniae	Klebsiella pneumoniae
8	Bacteroides fragilis group	VGS	Streptococcus pneumoniae	Serratia marcescens
9	Group B Streptococcus	Enterobacter cloacae	VGS	Streptococcus pneumoniae
10	Enterobacter cloacae complex	Streptococcus pneumoniae	Enterobacter cloacae	Enterobacter cloacae

CoNS, coagulase-negative Staphylococcus species; VGS, viridans group Streptococcus species.

This study.

Reference 4.

Reference 3.