Table 2. Effect of antibiotic rotation on the etiology of bacteremic isolates.

	Before cycling		After cycling
Organism	No. of isolates	Rate	No. of isolates	Rate	P
Gram-negative
Escherichia coli	6	2.6	7	1.5	0.38
Pseudomonas aeruginosa	4	1.7	3	0.7	0.24
Klebsiella pneumoniae	3	1.3	3	0.7	0.41
Other	0	0.0	1	0.2	1.00
Gram-negative, total	13	5.5	14	3.1	0.15
Gram-positive
Staphylococcus species, total	7	3.0	14	3.1	1.00
Coagulase negative staphylococci	6	2.6	11	2.4	1.00
Staphylococcus aureus	1	0.4	1	0.2	1.00
Enterococcus species, total	2	0.9	2	0.4	0.61
Enterococcus faecium	2	0.9	1	0.2	0.27
Enterococcus faecalis	0	0.0	1	0.2	1.00
Streptococcus species, total	1	0.4	3	0.7	1.00
Viridans Group streptococci	1	0.4	3	0.7	1.00
Gram-positive, total	10	4.3	19	4.1	1.00
Other	0	0.0	0	0.0	1.00
Isolates, total	23	9.8	33	7.2	0.26

Rate indicates number of positive cultures per 1000 patient days.

P-value shows statistical comparison for each variable between patients receiving pre-intervention and those receiving intervention.