Table 1.
Number of norovirus outbreaks by polymerase type, transmission, and outbreak setting *.
| Transmission |
Other Polymerases
Total (%) |
Novel GII.P16
Total (%) |
OR (99% CI) | Total No. |
| Foodborne | 74 (54.4) | 62 (45.6) | 1.00 | 136 |
| Person-to-person | 184 (48.8) | 193 (51.2) | 1.25 (0.75–2.11) | 377 |
| Other | 47 (55.3) | 38 (44.7) | 0.97 (0.47–1.98) | 85 |
| Setting |
Other Polymerases
Total (%) |
Novel GII.P16
Total (%) |
OR (99% CI) | Total No. |
| Non-Healthcare | 154 (56.6) | 118 (43.4) | 1.00 | 272 |
| Healthcare | 144 (45.4) | 173 (54.6) | 1.57 (1.02–2.41) ** | 317 |
* Other Polymerases include GII.P2, GII.P12, extant GII.P16, GII.P17, GII.P21, GII.Pe, GII.Pg, and GII.Pq; OR: Odds ratio; Other transmission routes include environmental (n = 3), indeterminate/other/unknown (n = 79), and waterborne (n = 3). Non-Healthcare settings include Banquet Facility (n = 9), Beach – Public (n = 1), Camp (n = 5), Caterer (n = 25), Child day care (n = 23), Event space (n = 14), Office/indoor workplace (n = 2), Other (n = 7), Prison/jail (n = 5), Private home/residence (n = 18), Religious facility (n = 2), Restaurant (n = 104), School/college/university (n = 57). Healthcare settings include Hospital (n = 20), Long-term care/nursing home/assisted living facility (n = 294), and Other healthcare facility (n = 3). ** Statistically significant (p-value: 0.007).