Table 2.
Bacterial findings in breast milk of women with and without symptoms of mastitis: Odds Ratios with 95% confidence intervals for symptoms of mastitis
| Healthy donors (n = 466) | Women with mastitis (n = 192) | ||||
| Bacterial Species | Occurrence of bacteria in breast milk n (%) | Mean (SD) counts (cfu/L) | Occurrence of bacteria in breast milk n (%) | Mean (SD) counts (cfu/L) | Odds Ratio for occurrence of mastitis symptoms (95%CI) |
| CNS | 419 (90%) | 106(± 1.1) | 160 (83%) | 106(± 1.1) | 0.60 (0.35, 0.91) p = 0.02 |
| Viridans Streptococci | 233 (50%) | 105(± 1.0) | 113 (59%) | 105(± 1.0) | 1.43 (1.02, 2.01) p = 0.04 |
| Staphylococcus aureus | 145 (31%) | 106(± 1.2) | 87 (45%) | 106(± 1.3) | 1.81 (1.29, 2.60) p = 0.001 |
| Group B streptococci | 47 (10%) | 106(± 1.5) | 41 (21%) | 106(± 1.4) | 2.40 (1.50, 3.71) p = <0.001 |
| Entercoccus faecalis | 28 (6%) | 106(± 1.1) | 16 (8%) | 106(± 1.1) | 0.70 (0.36, 1.43) p = 0.36 |
| Group G streptococci | 6 (1%) | 106 | 3 (2%) | 107 | |
| Group A streptococci | 3 (1%) | 107 | 2 (1%) | 107 | |
| Pneumococci | 4 (1%) | 107 | 5 (3%) | 105 | |
| Corynebacteria | 2 (0.4%) | 104 | 1 (0.5%) | 105 | |
| Enterobacteriaceae | 36 (8%) | 106 | 2 (1%) | 106 | |
| Acinetobacter species | 12 (3%) | 106 | 0 | 0 | |
| Pseudomonas species | 24 (5%) | 107 | 1 (0.5%) | 106 | |
| Bacillus species | 5 (1%) | 105 | 1 (0.5%) | 104 | |
| Propionibacterium species | 3 (1%) | 106 | 2 (1%) | 106 | |
| Candida species | 4 (1%) | 105 | 4 (2%) | 105 | |
CNS = coagulase negative staphylococci, SD = Standard Deviation