Research Article
Risk Factors for Colonization of E. coli in Atlantic Bottlenose Dolphins (Tursiops truncatus) in the Indian River Lagoon, Florida
Table 3
Univariate analysis of environmental risk factors for E. coli colonization among bottlenose dolphins.
| | E. coli + n (%) | E. coli − n (%) | OR (95% CI) |
| | Segment level analysis | | | | | Sewage treatment facilities | | | | | ≤8 | 9 (26.5) | 14 (22.6) | 1.00 | | 9–19 | 11 (32.4) | 22 (35.5) | 0.8 (0.3, 2.3) | | ≥20 | 14 (41.2) | 26 (41.9) | 0.8 (0.3, 2.4) |
| | Population density | | | | | <595.39 | 9 (26.5) | 14 (22.6) | 1.00 | | 595.39–754.39 | 9 (26.5) | 9 (14.5) | 1.6 (0.4, 5.4) | | 754.40–771.41 | 2 (5.9) | 13 (21.0) | 0.2 (0.0, 1.3) | | ≥771.42 | 14 (41.2) | 26 (41.9) | 0.8 (0.3, 2.4) |
| | County-level analysis | | | | | 48 hr precipitation (inches)* | | | | | ≤0.23 | 3 (13.3) | 24 (46.4) | 1.00 | | 0.24–0.80 | 19 (63.3) | 12 (21.4) | 10.3 (2.9, 36.9) | | ≥0.81 | 7 (23.3) | 18 (32.1) | 2.5 (0.6, 9.9) |
| | 30 day precipitation (inches) | | | | | ≤5.72 | 16 (47.1) | 20 (32.3) | 1.00 | | 5.73–6.24 | 4 (11.8) | 26 (41.9) | 0.2 (0.1, 0.7) | | ≥6.25 | 14 (41.2) | 16 (25.8) | 1.1 (0.4, 2.9) |
| | Water temperature (°C)* | | | | | ≥30.2 | 12 (48.0) | 21(39.6) | 1.00 | | 29.4–30.1 | 12 (48.0) | 15 (28.3) | 1.4 (0.5, 4.0) | | 28.4–29.39 | 1 (4.0) | 17 (32.1) | 0.1 (0.0, 0.9) |
| | Salinity (ppt)* | | | | | ≤23.01 | 11 (44.0) | 20 (37.7) | 1.00 | | 23.02–22.84 | 3 (12.0) | 26 (49.1) | 0.2 (0.1, 0.8) | | ≥33.85 | 11 (44.0) | 7 (13.2) | 2.9 (0.7, 9.5) |
| | Septic tanks per year | | | | | ≤70.286 | 7 (20.6) | 27 (43.5) | 1.00 | | 70.287–82.243 | 10 (29.4) | 25 (40.3) | 1.5 (0.5, 4.7) | | ≥82.244 | 17 (50.0) | 10 (16.1) | 6.6 (2.1, 20.5) |
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*Data not available for all individuals.
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