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[Epidemiology of beta-hemolytic streptococcus group B colonization in perinatology. Methodology considerations and
Insights
Group B Streptococcus (GBS) colonization affects pregnant women and newborns, leading to neonatal sepsis. Maternal rectal carriage is common, and current prevention strategies may leave term infants vulnerable to early-onset GBS disease.
Area of Science:
- Microbiology
- Neonatal Health
- Infectious Diseases
Context:
- Group B Streptococcus (GBS) is a significant cause of neonatal sepsis.
- Maternal genital and anorectal carriage of GBS is the primary source for neonatal infections.
- Variations in reported GBS carriage rates are linked to laboratory methods and sampling.
Purpose:
- To investigate GBS colonization rates in pregnant women and their newborns.
- To identify the primary site of GBS carriage in pregnant women.
- To evaluate the effectiveness of current GBS prevention strategies for neonatal sepsis.
Summary:
- GBS colonization was studied in 274 pregnant women and 275 newborns.
- Carriage rates were 25.91% in women (vaginal/anorectal swabs) and 6.14% in newborns (auricular/pharyngeal/rectal swabs).
- Higher rectal carriage in women suggests the gastrointestinal tract as the primary GBS reservoir.
Impact:
- Maternal GBS carriage is the main risk factor for neonatal colonization.
- Current intrapartum antibiotic prophylaxis guidelines may inadequately protect term infants from early-onset GBS disease.
- Further research is needed to prevent early-onset GBS infections in low-risk term infants.
Abstract:
GBS have attracted increasing attention in recent years as a major cause of serious neonatal sepsis. The maternal genital tract is the principal source of organism for babies with the most serious early onset form of disease. Reported rates of GBS carriage in the genital and anorectal tract of pregnant women vary widely: much of the variations is undoubtedly associated with differences in laboratory technique, sampling site and number of samples taken. The key bacteriological factor is the use of enrichment culture technique. We have studied GBS colonization in 274 pregnant women during labor and in their newborns (275). Carriage was documented in 25.91% women by vaginal (low portion) and anorectal swabs, and in 6.14% newborns by auricolar, pharyngeal and rectal swabs taken at birth and before leaving nursery. The higher rectal colonization rate in pregnant women suggests that the gastrointestinal tract is the primary site of GBS carriage. Colonized newborns have no obstetrics risk factors, except for maternal GBS carriage. Our data confirms that limiting antimicrobial intrapartum prophylaxis to premature infants leaves term infants (who account for 60% of the fetal cases of early onset disease) unprotected, unless membrane rupture is prolonged. Prevention of early onset infections among low-risk term infants will require additional investigations.