Lactational mastitis caused by Streptococcus lactarius

Daniel Tena1, Cristina Fernández1, Beatriz López-Garrido2

  • 1Section of Microbiology, University Hospital of Guadalajara, Guadalajara, Spain.

Human infections caused by Streptococcus lactarius have not been previously reported. In the present report, we describe a lactational mastitis caused by this organism. The infection occurred in a 28-year-old breast-feeding female, with a 10-days history of moderate pain on the right breast. The patient was cured after antibiotic treatment with levofloxacin for 21 days. Our case shows that S. lactarius should be considered as a cause of lactational mastitis. The introduction of molecular microbiology techniques can be extremely useful for knowing the implication of streptococci in lactational mastitis.

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