TABLE 1.

Comparative yield of 704 clinically significant isolates of bacteria and yeasts from paired FAN aerobic-FAN aerobic and FAN aerobic-FAN anaerobic blood culture bottles

Microorganism(s)	No. of isolates from:			P valuea
	Both bottle pairs	FAN aerobic- FAN aerobic bottles only	FAN aerobic- FAN anaerobic bottles only
Gram-positive cocci	317	38	59	0.03
S. aureus	139	23	38	0.05
Coagulase-negative Staphylococcus	92	0	0
Enterococcib	24	8	13	NS
S. pneumoniae	24	1	1	NS
Other streptococcic	37	6	6	NS
Other gram-positive coccid	1	0	1	NC
Listeria monocytogenes	1	0	0	NC
Gram-negative bacilli	154	41	55	NS
E. coli	83	21	26	NS
Other Enterobacteriaceaee	60	9	22	10.02
Other gram-negative bacillif	11	11	7	NS
Anaerobesg	9	5	16	0.01
Yeastsh	6	2	1	NC
Total (no. [%])	487 (69.2)	86 (12.2)	131 (18.6)	0.002

^aNS, not significant (P > 0.05); NC, not calculated when total number of isolates was ≤10.

^bIncludes 14 Enterococcus faecium, 27 Enterococcus faecalis, and 4 Enterococcus sp. isolates.

^cIncludes 5 group A, 28 group B, 1 group F, 4 group G, and 7 viridans group streptococci, 3 Streptococcus bovis, and 1 S. bovis var. isolate.

^dIncludes one Gamella sp. and one Abiotropia sp. isolate.

^eIncludes 6 Citrobacter freundii, 1 Enterobacter sakazaki, 6 Enterobacter cloacae, 1 Enterobacter aerogenes, 31 Klebsiella pneumoniae, 3 Klebsiella oxytoca, 17 Proteus mirabilis, 1 Proteus penneri, 2 Providencia stuartii, 4 Salmonella spp., 15 Serratia marcescens, and 4 Enterobacter agglomerans isolates.

^fIncludes 1 Acinetobacter baumannii, 1 Acinetobacter lwoffii, 16 Pseudomonas aeruginosa, 6 Haemophilus influenzae, 1 Neisseria meningitidis, 1 Aeromonas sp., 1 Campylobacter fetus, 1 Stenotrophomonas maltophilia, and 1 oxidase-positive gram-negative bacillus isolate.

^gIncludes two anaerobic gram-positive cocci, three Bacteroides fragilis group, two B. fragilis, one Bacteroides thetaiotaomicron, three Bacteroides vulgatus, one Bacteroides eggerthii, one Bacteroides urealyticus, one Fusobacterium nucleatum, three Clostridium septicum, five Clostridium perfringens, two Clostridium sp., four Eubacterium lentum, one Bifidobacterium sp., and one Bacteroides caccae isolate.

^hIncludes two Candida albicans, two Candida glabrata, one Candida guillermondii, three Candida tropicalis, and one Candida sp. (not albicans) isolate.