Table 9.
Outbreak health data by deficiency realm (in bold) and type.
| Deficiency Realm/Type 1 | Median Case Count (n) | Median Attack Rate (n) |
|---|---|---|
| Catchment | 37 (357) | 28.4% (54) |
| Sewage Contamination | 92 (86) | 50.5% (24) |
| Septic Tank Runoff | 75 (14) | 7.7% (3) |
| Animal Watershed Contamination | 32 (16) | 15.8% (2) |
| Rainfall/Runoff | 19 (11) | 44.0% (2) |
| Source Siting/Enclosure | 48 (27) | 14.3% (2) |
| Treatment | 44 (289) | 17.2% (21) |
| Chlorination | 30 (91) | 14.3% (10) |
| Filtration | 78 (33) | 23.0% (6) |
| Distribution | 85 (214) | 14.2% (40) |
| Cross-Connection | 47 (76) | 13.9% (5) |
| Backflow | 41 (18) | 24.4% (5) |
| Storage | 182 (18) | 29.3% (6) |
| Untreated Surface Water | 32 (30) | N/A (0) |
| Untreated Groundwater | 33 (174) | 69.5% (2) |
| Multiple Realms | 126 (280) | 16.7% (81) |
| Unknown | 31 (173) | 25.8% (16) |
1 Statistics are not given for the deficiency realm “Management”, with two outbreaks recorded, or for the other catchment, treatment, distribution and management realm-associated deficiency types.