TABLE 1.

Microorganisms isolated from unimicrobial and polymicrobial BSIs in which three or more blood cultures were obtained

Microorganism(s)	No. of isolates
	Total per hospital		Total by microorganism
	Duke University Medical Center	Robert Wood Johnson University Hospital
Staphylococcus aureus	97	85	182
Coagulase-negative staphylococci	36	88	124
Enterococcus spp.	41	65	106
Streptococcus pneumoniae	6	5	11
Viridans group streptococci	11	6	17
Other streptococci	13	7	20
Other gram-positive bacteria	4	13	20
Escherichia coli	47	20	67
Klebsiella pneumoniae	35	49	84
Other Enterobacteriaceae	46	26	72
Pseudomonas aeruginosa	26	13	39
Other gram-negative bacteria	18	21	39
Gram-positive anaerobes	7	2	9
Gram-negative anaerobes	7	4	11
Yeasts	31	45	76
Mycobacterium spp.	2	0	2