Table 2.
Summary of first detections in WW and PHO report clinical data.
| SARS-CoV-2 Lineage | Epi week of first detection in WW at Toronto Pearson and surrounding municipalities | Epi week of first clinical case (PHO) | Airport WW lead time | Municipal WW lead time | ||||
|---|---|---|---|---|---|---|---|---|
| Pooled Aircraft | Airport Terminals | Toronto municipal | Peel Region | York Region | ||||
| BQ* | 2022–34 | 2022–22 (33) | 2022–44 | 2022–42 | 2022–41 | 2022–37 | 15 weeks (4 weeks) | - |
| BA.2.75* | 2022–31 | 2022–17 (28) | 2022–42 | 2022–30 | 2022–23 | 2022–29 | 12 weeks (1 week) | 6 weeks |
| BF* | 2022–21 | 2022–7 (10) | 2022–21 | 2022–12 | 2022–21 | 2022–23 | 16 weeks (13 weeks) | 11 weeks |
| XBB* | 2022–39 | 2022–39 | 2022–45 | 2022–48 | 2022–50 | 2022–41 | 2 weeks | - |
| XBB.1.5* | 2023–1 | 2022–39 (49) | 2022–47 | 2023–1 | 2023–1 | 2022–49 | 10 weeks (0 weeks) | 2 weeks |
| XBB.1.16* | 2023–9 | 2023–10 | 2023–11 | 2023–12 | ND | 2023–10 | 1 week | - |
| XBB.1.9* | 2023–2 | 2023–6 | 2023–10 | 2023–9 | 2023–9 | 2023–5 | 3 weeks | - |
Table summarizing first detection for each lineage in all 5 WW sample groups and PHO report clinical data. Detections were recorded as “year – epi week number”. Lead time was calculated from the first WW detection (bolded in each row) to the first clinical detection. If the lineage was not detected before March 31st, 2023, the corresponding cell reads “ND” instead of a date. In cases where the initial detection was more than two weeks ahead of any other detection in this study, the second detection was also considered in this table and the values were placed in brackets. A dash in the lead time column means that the WW detection occurred after the first clinical detection so there was no lead time.