, Nabila Kadaoui, Vincent Lavallée, Éric Levac, Marie St-Amour, and François Milord
Figure. Wind rose profiles during each patient’s exposure period used in environmental investigation for legionellosis outbreak, Montérégie, Quebec, Canada, 2021. A–G) Cases C1–C7. Center crosshairs indicate center of the target area for each case; radii indicate percentage of frequency of winds over a time period, plotted by wind direction, with color bands showing wind speed ranges. Median and calm windspeeds are indicate for exposure times for each case. We calculated wind rose profiles for each of 7 case-patients during the time they were likely exposed. Wind rose profiles were generated by using meteorological data from High Resolution Deterministic Prediction System (HRDPS) modeling. Most case-patients, C1–C3 (panels A–C), C6 (panel G), and C7 (panel F), resided in the outbreak neighborhood; cases C4 (panel D) and C5 (panel E) were only in the area for a few hours, enabling more discriminating assessment of the possible exposures. C, case.