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Comparison of Legionella positivity before and after chlorination. Adapted from [80].
| Condition | Number of Positive Legionella Sites (%) | Number of Negative Legionella Sites (%) | p-Value |
|---|---|---|---|
| Before chlorination | 43 (21.1) | 161 (78.9) | <0.001 |
| With continuous hyperchlorination | 23 (5.5) | 393 (94.5) |
