Table 1. Causative Organisms for Breast Abscesses (2).

Aerobic gram-positive bacteria

Staphylococci, Streptococci

Aerobic gram-negative bacteria

Escherichia coli, Klebsiella pneumoniae, Pseudomonas aeruginosa, Proteus mirabilis, Salmonella spp

Anaerobic bacteria

Peptostreptococcus, Propionibacterium, Bacteroides, Lactobacillus, Eubacterium, Clostridium,Fusobacterium, Veillonella

Fungi

Candida, Cryptococcus

Other causes

Bartonella henselae, Mycobacteria, Actinomyces, Brucella

Parasites

Maggot infestation