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Table 4 Bacterial pathogens

From: Pyogenic brain abscess, a 15 year survey

Bacterial pathogens No. of isolates %
Streptococcus species 55 54%
Streptococcus milleri group 32  
Streptococcus oralis/sanguis 3  
Group A streptococcus 1  
Streptococcus pneumoniae 4  
Streptococcus bovis 1  
Streptococcus species 14  
Staphylococci 16 15%
Staphylococcus aureus 14  
Coagulase-negative staphylococci 2  
Gram-negative bacteria 8 8%
E.coli 2  
Haemophilus spp. 5  
Pseudomonas 1  
Anaerobic bacteria 17 17%
Fusobacteria 4  
Actinomyces 2  
Prevotella 2  
Peptostreptococci 2  
Other anerobic bacteria 7  
Nocardia 2 2%
Other species 4 4%
Negative culture, n= patients 14 14%
Mixed bacterial pathogens 11 11%
Primary microscopy compatible with several different bacterial species 23 23%
Positive gram-stain from pus/CSF 64 64%
Gram-stain positive/negative culture 4/65  
Negative gram-stain and positive culture 18  
Negative culture from brain pus 7