Table 3. Number of releases detected by season at a 16% infection rate.
| Season of release | No. releases | No. detected (%) |
|---|---|---|
| Winter | 248 | 131 (52.8) |
| Spring | 276 | 204 (73.9) |
| Summer | 189 | 165 (87.3) |
| Fall | 287 | 196 (68.3) |
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