TABLE 1.

Comparative yields of clinically important microorganisms in BM and BD blood culture bottles

Microorganism(s)	No. of isolates detected in:			P value
	Both bottles	BM bottles only	BD bottles only
Gram-positive cocci
Staphylococcus aureus	109	23	12	NSa
Coagulase-negative staphylococci	32	16	6	<0.05
Streptococcus spp.b	16	3	4	NS
Enterococcus spp.c	66	15	13	NS
Gram-positive bacillid	2	0	1	NS
Gram-negative bacilli
Enterobacteriaceaee	66	17	14	NS
Pseudomonas aeruginosa	11	4	2	NS
Other gram-negative bacteriaf	19	7	5	NS
Anaerobic bacteriag	0	0	2	NS
Fungih	27	23	8	<0.01
All microorganisms	348	108	67	<0.005

^aNS, not significant (P > 0.05).

^bIncludes eight viridans group Streptococcus, seven Streptococcus bovis, six Streptococcus pneumoniae, and two group G beta-hemolytic Streptococcus isolates.

^cIncludes 55 Enterococcus faecalis, 36 Enterococcus faecium, and 2 Enterococcus avium isolates and 1 Enterococcus sp. isolate.

^dIncludes one isolate each of Aerococcus viridans, Bacillus sp., and Corynebacterium sp.

^eIncludes 36 Klebsiella pneumoniae, 27 Escherichia coli, 7 Enterobacter cloacae, 6 Serratia marcescens, 6 Proteus mirabilis, 4 Klebsiella oxytoca, 2 Morganella morganii, 2 Proteus vulgaris, and 2 Salmonella enterica serovar Typhi isolates and 1 isolate each of Cedecea sp., Citrobacter freundii, Enterobacter aerogenes, Klebsiella ozaenae, and Proteus rettgeri.

^fIncludes 11 Acinetobacter baumannii, 7 Burkholderia cepacia, 8 Stenotrophomonas maltophilia, 2 Acinetobacter lwoffii, and 2 Alcaligenes faecalis isolates and 1 Aeromonas hydrophila isolate.

^gIncludes one isolate each of Clostridium perfringens and Bacteroides thetaiotaomicron.

^hIncludes 28 Candida albicans, 7 Candida tropicalis, 18 Candida glabrata, 2 Cryptococcus neoformans, and 2 Hansenula anomala isolates and 1 Scedosporium prolificans isolate.