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Table 1 Anaerobic blood culture broth isolates, set assignment, and results of Gram identification

From: Gram-negative and -positive bacteria differentiation in blood culture samples by headspace volatile compound analysis

Gram stain Microorganism Isolates (n = 128) Gram discrimination (n = 42)
Training set (n = 86) Validation set (n = 42) Identified (n = 35) Misidentified (n = 7)
Positive Enterococcus faecium 7 3 2 1
Listeria monocytogenes 1
Propioninbacterium acnes 6 1 1
Streptococcal sp.     
Streptococcus canis 1
S. constellatus 1 1
S. gallolyticus 2 3 3
S. hominis 1
S. mitis 2 2
S. pneumoniae 2
Staphylococcal sp.     
Staphylococcus aureus 6 2 2
S. aureus, methicillin-resistant 4
S. capitis 4
S. epidermidis 24 14 14
S. haemolyticus 1 2 1 1
S. lugdunensis 2 2 2
Negative Enterobacter aerogenes 2
Escherichia coli 16 7 5 2
Citrobacter freundii 1 1
Klebsiella oxytoca 1 1 1
Klebsiella pneumoniae 3 1 1
Proteus mirabilis 1 1
Pseudomonas aeruginosa 1
Salmonella paratyphi 1
Salmonella typhi 1 1 1