Table 1.
Time intervals between steps in the surveillance of enteric diseases, BC, 2012-13.
| Time interval1 | Salmonella median [IQ] (range) in days | STEC median [IQ] (range) in days | Shigella median [IQ] (range) in days | Listeria median [IQ] (range) in days | |
|---|---|---|---|---|---|
| Laboratory surveillance | 1: symptom onset to sample collection | 6 [3–11] (0–163) | 4 [3–8] (0–108) | 7 [4–13] (0–137) | 3 [1–4] (0–13) |
| 2: sample collection to sample receipt at PHL | 5 [3–6] (0–36) | 4 [2–6] (0–46) | 4 [3–5] (0–20) | 3 [2–4] (0–7) | |
| 3: sample receipt at PHL to PHL confirmation (incl. serotype or species) | 3 [2–4] (1–70) | 6 [2–21] (1–173) | 1 [1–3] (1–30) | 6 [3–8] (2–69) | |
| 4: PHL confirmation to start of PFGE run | 6 [3–8] (0–55) | 6 [5–10] (1–83) | 8 [5–12] (0–34) | 6 [5–8] (0–13) | |
| 5: start of PFGE run to report of PFGE result to provincial epidemiologists | 10 [8–22] (1–57) | 8 [5–10] (1–44) | 9 [7–14] (2–49) | NA2 | |
| 6: PHL confirmation to isolate sent for PT | 7 [3–8] (0–27) | NA | NA | NA | |
| 7: isolate sent for PT to receipt of PT result at PHL | 5 [5-6] (2–26) | NA | NA | NA | |
| 8: receipt of PT result at PHL to report of PT result to provincial epidemiologists | 9 [2–22] (0–38) | NA | NA | NA | |
| A1: symptom onset to report of results to provincial epidemiologists | 35 [25–48] (15–179) | 26 [22–34] (13–99) | 36 [27–49] (18–165) | NA2 | |
|
| |||||
| Epidemiological surveillance | 9: sample collection to regional health authority notification | 4 [3–6] (0–18) | 5 [3–7] (0–30) | 4 [3–6] (0–35) | 3 [3-4] (1–8) |
| 10: regional health authority notification to case report entry | 0 [0-0] (0–20) | 0 [0-0] (0–2) | 0 [0-0] (0–3) | 0 [0-0] (0-0) | |
| 11: case report entry to first attempt to contact | 1 [0–2] (0–62) | 0 [0-1] (0–19) | 0 [0-1] (0–31) | 1 [1–5] (0–55) | |
| 12: first attempt to contact to completed interview | 0 [0-1] (0–43) | 0 [0-1] (0–38) | 0 [0-1] (0–29) | 0 [0–3] (0–6) | |
| B1: symptom onset to completed interview | 14 [9–21] (2–168) | 12 [8–18] (3–119) | 14 [10–21] (5–148) | 13 [8–17] (3–61) | |
1Numbers refer to intervals in Figure 1. 2Dates for reporting Listeria PFGE to provincial epidemiologists were not available (not in regular weekly report).