Table 3. Effect of antibiotic rotation on the etiology of stool isolates.

	Before cycling		After cycling
Organism	No. of isolates	Rate	No. of isolates	Rate	P
Gram-negative
Escherichia coli	45	19.2	53	11.5	<0.05
Klebsiella pneumoniae	19	8.1	52	11.3	0.26
Pseudomonas aeruginosa	5	2.1	4	0.9	0.18
Other	20	8.5	48	10.5	0.52
Gram-negative, total	89	37.9	157	34.2	0.34
Gram-positive
Staphylococcus species, total	46	19.6	76	16.6	0.39
Coagulase negative staphylococci	46	19.6	74	16.1	0.33
Staphylococcus aureus	0	0.0	2	0.4	0.55
Enterococcus species, total	66	28.1	129	28.1	1.00
Enterococcus faecium	7	3.0	33	7.2	<0.05
Enterococcus faecalis	29	12.3	55	12.0	0.91
Streptococcus species, total	17	7.2	34	7.4	1.00
Viridans Group streptococci	17	7.2	26	5.7	0.42
Other	7	3.0	26	5.7	0.14
Gram-positive, total	136	57.9	265	57.7	1.00
Other	2	0.9	16	3.5	<0.05
Isolates, total	227	96.6	438	95.4	0.86

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.