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Updated: Aug 13, 2026

A Murine Model of Group B Streptococcus Vaginal Colonization
Published on: November 16, 2016
Three fatal cases of invasive serotype VI group B streptococcal infection
Kousaku Matsubara1, Hiroshige Mikamo, Makiko Numa
1Department of Pediatrics, Nishi-Kobe Medical Center, 5-7-1 Kojidai, Nishi-ku, Kobe 651-2273, Japan. kskmatsu@s4.dion.ne.jp
Abstract:
Serotype VI group B Streptococcus (GBS) has been almost frequently isolated among colonizing strains of pregnant women in Japan, but the clinical features and prognosis, when a patient is invasively infected, are largely unknown. We report, for the first time, three cases of fatal infection caused by serotype VI GBS; two cases were middle-aged men with necrotizing fasciitis/cellulitis, sepsis, and toxic shock syndrome with poorly controlled diabetes as underlying conditions; and one was a premature infant with intrauterine infection. Our results indicated that type VI GBS is pathogenic for humans not only in fetuses but also adults, and has the ability to be fatal, at least in selected patients.
Insights
Group B Streptococcus (GBS) serotype VI is a significant cause of invasive infections in both adults and infants. This study highlights fatal outcomes in adults with underlying conditions and premature infants.
Area of Science:
- Microbiology
- Infectious Diseases
- Clinical Medicine
Background:
- Group B Streptococcus (GBS) serotype VI is prevalent in pregnant women in Japan.
- The clinical presentation and outcomes of invasive serotype VI GBS infections are not well-documented.
Observation:
- Three cases of fatal infections caused by serotype VI GBS are presented.
- Two cases involved middle-aged men with severe conditions like necrotizing fasciitis, sepsis, and toxic shock syndrome, complicated by diabetes.
- One case involved a premature infant with intrauterine infection.
Findings:
- Serotype VI GBS demonstrates pathogenicity in both adult and fetal populations.
- The bacterium can cause fatal outcomes, particularly in vulnerable individuals with pre-existing health issues.
Implications:
- This study expands the understanding of serotype VI GBS as a human pathogen beyond neonatal infections.
- It underscores the need for clinical vigilance and potentially tailored treatment strategies for severe serotype VI GBS infections in adults and neonates.
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