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| Confirmed etiologic agent | No. (%) outbreaks with confirmed etiologic agent | Median no. days from onset of symptoms to outbreak detection (range) |
|---|---|---|
| Salmonella spp. | 20 (24) | 16 (2–83) |
| Campylobacter spp. | 3 (4) | 8 (7–9) |
| Escherichia coli O157:H7 | 4 (5) | 8 (7–18) |
| Norovirus | 44 (53) | 3 (0–11) |
| Bacillus cereus, Staphylococcus aureus, and Clostridium perfringens | 10 (12) | 1 (0–3) |
