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A Murine Model of Group B Streptococcus Vaginal Colonization
Published on: November 16, 2016
Group B Streptococcus early-onset disease in Emilia-romagna: review after introduction of a screening-based approach
Alberto Berardi1, Licia Lugli, Dante Baronciani
1Unità Operativa di Terapia Intensiva Neonatale, Azienda Ospedaliero-Universitaria Policlinico, Modena, Modena, Italy. berardi.alberto@policlinico.mo.it
Insights
Most early-onset Group B Streptococcus (GBS) infections occur in infants born to GBS-negative mothers, indicating missed prevention opportunities rather than prophylaxis failures.
Area of Science:
- Neonatal infectious diseases
- Bacteriology
- Public health
Background:
- Group B Streptococcus (GBS) is a primary cause of neonatal bacterial infections.
- Despite prevention efforts, early-onset GBS infections persist.
Purpose of the Study:
- Analyze GBS infection trends and identify persistence factors.
- Evaluate antenatal screening and intrapartum chemoprophylaxis impact on infection presentation.
Main Methods:
- Prospective, population-based cohort study in Emilia-Romagna, Italy (2003-2008).
- Analysis of invasive GBS infections in infants < 7 days old.
Main Results:
- 61 early-onset GBS infections identified among 214,120 live births.
- Most infections occurred in infants born to GBS-negative mothers, including those with no risk factors.
- Meningitis cases were predominantly in term infants born to culture-negative mothers; disease severity correlated with lower gestational age.
Conclusions:
- The majority of GBS infections occurred in infants whose mothers screened negative for GBS.
- Missed prevention opportunities, not prophylaxis failures, are the main contributors to the early-onset GBS disease burden.
Background:
Group B Streptococcus (GBS) is a leading cause of neonatal bacterial infections. Early-onset infections have decreased in recent years but, despite considerable efforts poured into prevention, cases continue to occur.
Objectives:
To analyze trends and identify determining factors for the persistence of the GBS infections. To evaluate the impact of antenatal screening and intrapartum chemoprophylaxis on the clinical presentation of the infection.
Methods:
A prospective cohort, population-based study has been ongoing in Emilia-Romagna (Italy) since 2003. Invasive GBS infections, observed between 2003 and 2008 in infants aged < 7 days were analyzed.
Results:
Among 214,120 live births, 61 early-infections were observed. Fourteen infants (23.0%) were born preterm. Among 47 infants who were delivered at term, 28 were born to mothers who had no risk factors and 7 were born to mothers who had none other than GBS colonization. Forty-one women at term had been screened prenatally; among them, only 10 were documented as GBS culture-positive.Disease severity was highest in infants at lower gestational ages, but most meningitis cases were observed in term infants born to mothers who were GBS culture-negative at screening.Nine newborns had culture-proven infection despite having received intrapartum antibiotics. They were born to mothers with > or =1 obstetrical risk factors and 5 mothers had been treated during labor with macrolides.
Conclusion:
Most infections presented in infants whose mothers had been screened as GBS culture-negative. Missed opportunities for prevention contributed more than prophylaxis failures to the early-onset disease burden.
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