TABLE 2.

Identification with FISH of gram-positive and gram-negative microorganisms in growth-positive blood cultures

MicroorganismNo. of samples positive by cultureNo. of samples positive by FISHc
Genus or familyGenus or species
Gram-positive microorganisms
    Coagulase-negative     staphylococci949494
    Staphylococcus aureus201817
    Streptococcus pneumoniae222
    Streptococcus pyogenes111
    Other streptococcia99
    Enterococcus faecalis222
    Enterococcus faecium222
    Other enterococci11
    Candida albicans555
    Candida tropicalis111
    Otherb6
    Total143135124
Gram-negative microorganisms
    Escherichia coli232321
    Klebsiella pneumoniae666
    Enterobacter cloacae66
    Proteus mirabilis4
    Nontyphoid salmonellae33
    Other Enterobacteriaceaed32
    Pseudomonas aeruginosa66
    Othere6
    Total574633
  • a These include Streptococcus mitis (n = 3), Streptococcus oralis (n = 2), hemolytic Streptococcus group C (n = 2), hemolytic Streptococcus group G, and Streptococcus sanguis.

  • b This group consisted of diphtheroid rods (n = 2), Propionibacterium acnes (n = 2), Corynebacterium species, and Bacillus cereus.

  • c Values for gram-negative microorganisms include identification of the family with the Enterobacteriaceae probe and identifications of the genus or species. For gram-positive microorganisms, identifications are made only for genus and species.

  • d Other Enterobacteriaceae include Serratia marcescens, Klebsiella oxytoca, and Morganella morganii.

  • e These include Acinetobacter anitratus (n = 2), nonfermenting gram-negative rods (n = 2), Fusobacterium nucleatum, and Aeromonas caviae.