Correlation between the results of the placental bacterial cultures and histological CA
| n=376 Placentas | Presence of CA n=101 (26.9%) | Absence of CA n=275 (73.1%) |
|---|---|---|
| Positive cultures n=73 (%) | 28/101 (27) | 45/275 (16)* |
| Monotypic flora (%) | 18/28 (64) | 30/45 (60) |
| Gram-positive cocci† | 5 | 11 |
| Gram-positive bacilli‡ | 4 | 4 |
| Gram-negative bacilli§ | 5 | 7 |
| Anaerobic Gram-positive cocci†† | 0 | 1 |
| Anaerobic Gram-positive bacilli‡‡ | 0 | 3 |
| Anaerobic Gram-negative bacilli§§ | 4 | 4 |
| Negative cultures n=303 (%) | 73 (72) | 230 (83) |
| Sterile (%) | 50 (68.4) | 176 (64) |
| Colonising bacteria from the P/V flora (%) | 15 (20.5) | 18 (6)** |
| Contaminant bacteria (%) | 8 (10.9) | 38 (13.8) |
*p=0.01 by non-paired t test.
**p=0.002.
†Gram-positive cocci: Group B Streptococcus (Streptococcus agalactiae), Streptococcus α-haemolyticus, group F/G/NG Streptococcus (Streptococcus anginosus/milleri, Streptococcus mitis, Streptococcus bovis), Staphylococci (Staphylococcus lugdunensis, Staphylococcus aureus, coagulase-negative staphylococcus), Enterococcus sp.
‡Gram-negative cocci: Neisseria, Acinetobacter.
§Gram-positive bacilli: Listeria monocytogenes, Lactobacillus, Bacillus cereus, Corynebacterium.
¶Gram-negative bacilli: Haemophilus influenzae, Enterobacteriaceae (E coli, Enterobacter cloacae, Klebsiella sp., Morganella morgani, Pantoea agglomerans), Achromobacter, Stenophomonas.
††Anaerobic Gram-positive cocci: Peptostreptococcus sp., Finegoldia magna.
‡‡Anaerobic Gram-positive bacilli: Bifidobacterium longum/dentum, Propionibacterium sp.
§§Anaerobic Gram-negative bacilli: Bacteroides fragilis, Prevotella bivia, others.
CA, chorioamnionitis.