Table 2:
Serratia incidence by study year and gestational age category among infants with any late infection
| Category | All infants with LOI (n)* | Infants with Serratia LOI (n, %) | Serratia incidence rate per 1000 infants with any late infection (95% CI) |
|---|---|---|---|
| Overall | 10679 | 279 (2.6) | 26.1 (22.4, 30.4) |
| Year of Birth | |||
| 2018 | 3550 | 95 (2.7) | 26.8 (20.6, 34.7) |
| 2019 | 3651 | 98 (2.7) | 26.8 (20.8, 34.6) |
| 2020 | 3478 | 86 (2.5) | 24.7 (18.8, 32.5) |
| Gestational Age (weeks) | |||
| ≤23 | 1884 | 54 (2.9) | 28.7 (20.3, 40.3) |
| 24–25 | 3739 | 115 (3.1) | 30.8 (24.3, 38.9) |
| 26–27 | 2623 | 69 (2.6) | 26.3 (19.4, 35.6) |
| 28–29 | 1591 | 23 (1.5) | 14.5 (8.5, 24.4) |
| >29 | 842 | 18 (2.1) | 21.4 (11.8, 38.4) |
| Birth Weight (grams) | |||
| ≤500 | 875 | 25 (2.8) | 27.8 (16.8, 45.7) |
| 501–750 | 4228 | 139 (3.2) | 31.8 (25.7, 39.4) |
| 751–1000 | 2844 | 70 (2.4) | 24.0 (17.7, 32.5) |
| 1001–1250 | 1465 | 34 (2.3) | 22.7 (14.7, 34.9) |
| 1251–1500 | 854 | 11 (1.3) | 12.7 (6.0, 26.9) |
| ≥1500 | 132 | 0 (0.0) | 0.0 |
*
Infants with Serratia, other late bacterial infections (including coagulase-negative Staphylococcus), or fungal infections.