Microbial Diversity in Amniotic Fluid During Preterm Labor
Author Information
Author(s): DiGiulio Daniel B., Romero Roberto, Amogan Harold P., Kusanovic Juan Pedro, Bik Elisabeth M., Gotsch Francesca, Kim Chong Jai, Erez Offer, Edwin Sam, Relman David A.
Primary Institution: Stanford University School of Medicine
Hypothesis
The study investigates the diversity and abundance of microbes in the amniotic fluid of women in preterm labor and their association with clinical outcomes.
Conclusion
The study found that the amniotic cavity of women in preterm labor contains a greater diversity of microbes than previously thought, which may play a role in preterm delivery.
Supporting Evidence
- The study detected 18 different microbial taxa in amniotic fluid, indicating greater diversity than previously recognized.
- PCR methods revealed a higher prevalence of microbes compared to traditional culture methods.
- A positive PCR result was associated with a significantly increased risk of histologic chorioamnionitis.
- The positive predictive value of PCR for preterm delivery was found to be 100%.
- Microbial DNA concentration correlated significantly with gestational age at delivery.
Takeaway
Doctors found many different germs in the fluid around babies before they were born, which might help explain why some babies are born too early.
Methodology
The study used broad-range end-point and real-time PCR assays to analyze ribosomal DNA from amniotic fluid samples.
Potential Biases
Potential PCR inhibition and biases in DNA extraction and amplification could affect results.
Limitations
DNA degradation over time and the small sample volume may have affected the results.
Participant Demographics
Women with spontaneous preterm labor and intact membranes, aged between 18 and 35 weeks of gestation.
Statistical Information
P-Value
p<0.002
Confidence Interval
95% CI, 2.4 to 172
Statistical Significance
p<0.002
Digital Object Identifier (DOI)
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