Possible association between amniotic fluid micro-organism infection and microflora in the mouth.
OBJECTIVE
To determine whether oral bacteria are found in the amniotic cavity.


METHODS
Laboratory based analysis of clinical samples.


METHODS
Royal London Hospital, Whitechapel.


METHODS
Forty-eight women attending for elective caesarean section.


METHODS
Dental plaque, a high vaginal swab, amniotic fluid and chorioamnion tissue were taken from women with intact membranes.


METHODS
Samples were investigated using culture and microscopy for the presence of microorganisms. Amniotic fluid was analysed by polymerase chain reaction (PCR) for the presence of the ubiquitous 16S rRNA gene specific to most eubacteria. Samples were analysed using PCR genus and species specific primers directed to bacterial taxa found as part of the normal oral microflora (Streptococcus spp. and Fusobacterium nucleatum). Levels of prostaglandin E2 and cytokines were measured in amniotic fluid.


RESULTS
Amniotic fluid was positive for universal bacteria PCR, Streptococcus spp. PCR and F. nucleatum PCR in 34/48, 20/48 and 7/48 of cases, respectively. Streptococcus spp. and F. nucleatum were cultured from the dental plaque, vagina and amniotic fluid of 48/48, 14/48, 0/48 and 29/48, 6/48, 0/48 subjects, respectively. A significant association was found between detection of microbial DNA (universal and F. nucletum) and complications in previous pregnancies including miscarriage, intrauterine death, neonatal death, preterm delivery and premature rupture of membranes (P < 0.05 and P < 0.01, respectively). Prostaglandin E2 and cytokine levels, with the exception of IL-1alpha, were not significantly different between women with and without evidence of infection.


CONCLUSIONS
The results indicate that Streptococcus spp. and F. nucleatum in the amniotic fluid may have an oral origin.
Bearfield
Caroline
C
Barts and The London, Queen Mary's School of Medicine and Dentistry, University of London, UK.
Davenport
Elizabeth S
ES
Sivapathasundaram
Vythil
V
Allaker
Robert P
RP
D000328:Adult; D000653:Amniotic Fluid / Q000382:microbiology*; D001419:Bacteria / Q000302:isolation & purification*; D002478:Cells, Cultured; D002585:Cesarean Section; D016207:Cytokines / Q000032:analysis; D004269:DNA, Bacterial / Q000032:analysis; D005260:Female; D016967:Fusobacterium nucleatum / Q000302:isolation & purification; D006801:Humans; D009055:Mouth / Q000382:microbiology*; D016133:Polymerase Chain Reaction / Q000379:methods; D011247:Pregnancy; D011251:Pregnancy Complications, Infectious / Q000382:microbiology*; D011458:Prostaglandins E / Q000032:analysis; D012307:Risk Factors; D013291:Streptococcus / Q000302:isolation & purification
D016207:Cytokines; D004269:DNA, Bacterial; D011458:Prostaglandins E