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Related Experiment Video

Updated: Dec 7, 2025

Intraductal Injection of LPS as a Mouse Model of Mastitis: Signaling Visualized via an NF-κB Reporter Transgenic
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Pneumococcal puerperal mastitis in a lactating mother.

T Skalidis1, A Stamnidi1, V Syriopoulou2

  • 1Central Laboratories, IASO Gynecology, Maternity and Pediatric Hospital, IASO Group Hospitals, Athens, Greece.

Access Microbiology
|September 25, 2020
PubMed
Summary

Pneumococcal mastitis is rare, with only five cases reported since 1950. This case highlights Streptococcus pneumoniae as a potential cause of puerperal mastitis in breastfeeding mothers.

Keywords:
breast-feedingpneumococcal infectionpuerperal mastitis

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Area of Science:

  • Medical Microbiology
  • Infectious Diseases
  • Obstetrics and Gynecology

Background:

  • Mastitis, commonly caused by Staphylococcus aureus, affects breastfeeding mothers.
  • Puerperal mastitis is an inflammation of the breast during the postpartum period.
  • Literature review identified only four previous cases of pneumococcal mastitis (Streptococcus pneumoniae) between 1950 and March 2018.

Observation:

  • A breastfeeding mother presented with symptoms of severe inflammation in her left breast, including heat, pain, redness, and swelling.
  • Milk cultures revealed a high bacterial load of Streptococcus pneumoniae (exceeding 10^5 cfu/ml).
  • The isolated Streptococcus pneumoniae strain was serotype 11, not covered by the Prevnar-13 vaccine.

Findings:

  • The Streptococcus pneumoniae strain demonstrated full susceptibility to common antibiotics, including beta-lactams, macrolides, lincosamides, vancomycin, and tetracycline.
  • The patient's clinical presentation and laboratory results confirmed pneumococcal mastitis.
  • This case adds to the limited documented instances of Streptococcus pneumoniae causing mastitis.

Implications:

  • Streptococcus pneumoniae should be considered in the differential diagnosis of puerperal mastitis, particularly in breastfeeding women.
  • The findings suggest that Streptococcus pneumoniae can be a causative agent of mastitis, challenging the predominant association with Staphylococcus aureus.
  • Further research may be warranted to understand the epidemiology and optimal treatment strategies for pneumococcal mastitis.