Johns Hopkins ABX Guide
Mastitis
PATHOGENS
- Noninfectious causes
- Staphylococcus aureus including MRSA
- Coagulase-negative Staphylococci
- Corynebacterium spp. (role in disease uncertain but consider in granulomatous inflammatory mastitis)
- C. kroppenstedtii
- Clinical isolates of this organism have been almost entirely reported in women with breast abscesses and/or granulomatous mastitis.
- C. amycolatum
- C. tuberculostearicum
- C. kroppenstedtii
- Streptococcal species (e.g, Streptococcus mitis)
- Peptostreptococcus
- Prevotella species
- Bacteroides species
- Mycobacterium tuberculosis (endemic regions especially, TB mastitis generally rare but may be up to 4% of TB presentations in India)
- In patients with a history of recurrent breast abscesses, up to 20% have mixed flora.
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Last updated: July 4, 2022
Citation
Auwaerter, Paul. "Mastitis." Johns Hopkins ABX Guide, The Johns Hopkins University, 2022. Johns Hopkins Guides, www.hopkinsguides.com/hopkins/view/Johns_Hopkins_ABX_Guide/540333/7/Mastitis.
Auwaerter P. Mastitis. Johns Hopkins ABX Guide. The Johns Hopkins University; 2022. https://www.hopkinsguides.com/hopkins/view/Johns_Hopkins_ABX_Guide/540333/7/Mastitis. Accessed October 30, 2025.
Auwaerter, P. (2022). Mastitis. In Johns Hopkins ABX Guide. The Johns Hopkins University. https://www.hopkinsguides.com/hopkins/view/Johns_Hopkins_ABX_Guide/540333/7/Mastitis
Auwaerter P. Mastitis [Internet]. In: Johns Hopkins ABX Guide. The Johns Hopkins University; 2022. [cited 2025 October 30]. Available from: https://www.hopkinsguides.com/hopkins/view/Johns_Hopkins_ABX_Guide/540333/7/Mastitis.
* Article titles in AMA citation format should be in sentence-case
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