Table 2.

Distribution of Microorganisms among Cases and Controls, 2000–2008

Microorganism (genus)	Cases (n=298)	Controls (n=667)	p-value
Enterococcus sp.	90 (30.2%)	149 (22.3%)	0.011
Candida sp.	50 (16.8%)	146 (21.9%)	0.082
Escherichia coli	41 (13.8%)	123 (18.4%)	0.090
Coagulase-positive staphylococcus	27 (9.1%)	17 (2.6%)	<0.001
Pseudomonas sp.	23 (7.7%)	48 (7.2%)	0.878
Coagulase-negative staphylococcus	17 (5.7%)	27 (4.1%)	0.331
Klebsiella sp.	17 (5.7%)	67 (10.0%)	0.037
Enterobacter sp.	14 (4.7%)	30 (4.5%)	1.000
Proteus sp.	5 (1.7%)	17 (2.6%)	0.546
Citrobacter sp.	4 (1.3%)	5 (0.8%)	0.601
Acinetobacter sp.	3 (1.0%)	2 (0.3%)	0.353
Streptococcus sp.	3 (1.0%)	11 (1.6%)	0.631
Other	4 (1.3%)	21 (3.1%)	0.158
Unspecified	-	4 (0.6%)	-

Other microorganism category includes Elizabethkingae, Morganella, and Serratia microorganisms