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Journal of the Korean Society of Neonatology 2006;13(1):97-104.
Published online May 1, 2006.
Neonatal Sepsis Caused by Multi-Resistant Streptococcus Mitis.
Jon Soo Kim, Youn Jeong Shin, Soo Jin Lee, Ho Jin Park
Department of Pediatrics, Eulji University School of Medicine, Daejoen, Korea. esthermd@hanmail.net
다제내성을 지닌 Streptococcus mitis에 의한 신생아 패혈증
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Abstract
PURPOSE
Streptococcus mitis, one of the Viridans streptococci, is a normal female genital tract flora. It is known as a common cause of chorioamnionitis and subsequent abortions in perinatal period. Although it has been suggested to be less virulent they can cause severe neonatal infections. In this study, we focused on the clinical presentations of neonatal septicemia and the antibiotic susceptibilities of Streptococcus mitis.
METHODS
Nine newborns for whom Streptococcus mitis was isolated from normally sterile sites were seen in the NICU of Eulji University Hospital from Jan. 1 to Dec. 31 2005. Medical records were reviewed for the perinatal risk factors, maternal clinical manifestations, obstetric complications and the placental pathologic findings. We also observed the neonatal clinical courses and antibiotic susceptibilities of Streptococcus mitis.
RESULTS
All nine infants were high-risk newborns because of prematurity, low birth weight and/or co-morbid diseases. Clinical manifestations varied from asymptomatic to severe neonatal sepsis. Six cases resistant to ampicillin were all sensitive to vancomycin. Five among them had clinical sepsis, and one infant was asymptomatic. Three cases were sensitive to ampicillin, two of them were asymptomatic and one infant with sepsis was successfully treated with ampicillin and aminoglycoside.
CONCLUSION
Streptococci mitis should not be overlooked as a contaminant when isolated from normally sterile sites. If Streptococci mitis or Viridans streptococci are recovered from a high-risk newborn showing no clinical response to penicillin, it would be better to switch antibiotics to vancomycin until the susceptibility results available.
Key Words: Viridans streptococci, Streptococcus mitis, Neonatal sepsis, Vancomycin
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