Table 4. Characteristics of MRSA and VRE clusters detected by routine infection control surveillance compared to WHONET-SaTScan.
| Cluster Time Period | Infection Control Detection | WHONET-SaTScan Detection | Dual Detection | ||||||
| n Clusters | Cases (Mean) | Duration (Mean Days) | Cluster Typea | n Clusters | Cases (Mean) | Duration (Mean Days) | Cluster Type | n Clusters | |
| MRSA | |||||||||
| 2002 | 14 | 10.8 | 96.5 | Ward | 1 | 14 | 67.0 | Antibiotic profile | 0 |
| 2003 | 11 | 11.1 | 100.3 | Ward | 0 | — | — | — | 0 |
| 2004 | 18 | 6.9 | 65.3 | Ward | 1 | 8 | 54.0 | Ward | 1 |
| 2005 | 18 | 5.9 | 52.4 | Ward | 3 | 3.7 | 8.3 | Ward, ward/service, antibiotic profile | 0 |
| 2006 | 12 | 4.9 | 48.0 | Ward | 2 | 4 | 6.0 | Service, antibiotic profile | 0 |
| 5-y total | 73 | — | — | — | 7 | — | — | — | 1 |
| Annual mean | 14.6 | 7.9 | 72.5 | — | 1.4 | 5.9 | 27.1 | — | 0.2 |
| Annual median | 14 | 6.9 | 65.3 | — | 1.0 | 4.0 | 8.3 | — | 0 |
| VRE | |||||||||
| 2002 | 15 | 7.6 | 71.2 | Ward | 2 | 5.5 | 43.0 | Antibiotic profile | 0 |
| 2003 | 12 | 6.4 | 62.8 | Ward | 1 | 4.0 | 18.0 | Antibiotic profile | 0 |
| 2004 | 20 | 8.2 | 74.1 | Ward | 1 | 2.0 | 17.0 | Antibiotic profile | 0 |
| 2005 | 18 | 7.2 | 69.1 | Ward | 0 | — | — | — | 0 |
| 2006 | 22 | 6.0 | 58.3 | Ward | 0 | — | — | — | 0 |
| 5-y total | 87 | — | — | — | 4 | — | — | — | 0 |
| Annual mean | 17.4 | 7.1 | 67.1 | — | 0.8 | 2.3 | 15.6 | — | 0 |
| Annual median | 18 | 7.2 | 69.1 | — | 1 | 2 | 17 | — | 0 |
a
Infection Control identification of clusters was limited to wards only.