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Proliferation of group B streptococci in human amniotic fluid in vitro
Abstract:
The group B Streptococcus is one of the most virulent organisms causing perinatal infection. Human amniotic fluid from the second and third trimesters was pooled and analyzed for electrolytes, protein, albumin, zinc, inorganic phosphorus, ferritin, lysozyme, and immunoglobulins. We inoculated replicates of specimens with known virulent strains of group B streptococci (893, 891, and 878) and Escherichia coli (C5) with Todd-Hewitt broth and normal saline solution used as controls. Group B streptococci strains 893 and 891 proliferated rapidly at rates similar to their rates in Todd-Hewitt Broth. Strain 878 grew at a rate slower than that of strains 893 and 891. The amniotic fluid specimens were similar with respect to factors reported as inhibitory to bacterial proliferation. Second- and third-trimester amniotic fluid supports the growth of group B streptococci as well as a culture medium optimized for bacterial growth. Strain-specific variance in group B streptococci growth rates in amniotic fluid may have clinical significance for those at risk for group B streptococci infection.
Insights
Second- and third-trimester amniotic fluid supports rapid growth of virulent group B Streptococcus strains, similar to optimized bacterial culture media. This finding highlights potential clinical significance of strain-specific bacterial proliferation in perinatal infections.
Area of Science:
- Obstetrics and Gynecology
- Microbiology
- Perinatal Medicine
Background:
- Group B Streptococcus (GBS) is a significant cause of perinatal infections.
- Understanding GBS proliferation in the intrauterine environment is crucial for managing neonatal risks.
Purpose of the Study:
- To evaluate the growth-supporting capacity of human amniotic fluid for virulent group B Streptococcus strains.
- To compare GBS growth in amniotic fluid with standard bacterial culture media.
Main Methods:
- Human amniotic fluid from second and third trimesters was analyzed for biochemical components.
- Virulent strains of GBS (893, 891, 878) and Escherichia coli (C5) were inoculated into amniotic fluid.
- Growth rates were compared to those in Todd-Hewitt broth and normal saline.
Main Results:
- Amniotic fluid supported rapid proliferation of GBS strains 893 and 891, comparable to Todd-Hewitt broth.
- GBS strain 878 exhibited slower growth in amniotic fluid compared to strains 893 and 891.
- Amniotic fluid contained factors that did not inhibit bacterial proliferation, supporting robust GBS growth.
Conclusions:
- Second- and third-trimester amniotic fluid effectively supports the growth of virulent group B Streptococcus.
- Strain-specific variations in GBS growth rates within amniotic fluid may influence clinical outcomes in at-risk pregnancies.