Analysis of 11 Cases of Neonatal Invasive Streptococcus pyogenes Infection

Abstract

Abstract Objective This study aimed to improve the understanding of clinical characteristics of neonatal invasive Streptococcus pyogenes infection (iSPI). Methods A retrospective study was performed to analyze the clinical and laboratory aspects of culture-confirmed neonatal iSPI cases during 2010 to 2017. Results Eleven cases of neonatal iSPI were confirmed. The ages ranged from 2 hours to 26 days. Ten cases had positive blood culture results and one had positive cerebrospinal fluid culture for S. pyogenes. Seven patients had fever and seven had identified focal infection, including six skin and soft tissue infections and one case of pneumonia. All of the S. pyogenes strains were sensitive to penicillin, cefotaxime, and vancomycin, and nine were resistant to clindamycin and erythromycin. Six patients received penicillin or cephalosporin monotherapy. Three patients received meropenem plus vancomycin initially, and then two of them were switched to penicillin and one to vancomycin after pathogen identification. Two cases were treated with vancomycin monotherapy. All cases were discharged after being cured or showing improvement. Conclusion Skin and soft tissue infection is a common manifestation of neonatal iSPI. Streptococcus pyogenes strains are highly sensitive to β-lactams, which should be used as the first-choice treatment.