Fifty years after its discovery, experts reflect on Legionnaires' disease, highlighting how modernization like HVAC systems can unintentionally increase pathogen exposure. They emphasize the importance of public health updates.

<img alt="A culture dish spotted with Legionella bacteria." height="349" src="https://i.cbc.ca/ais/1e597fd5-22c1-476b-8ea6-7659e0873a84,1780675780575/full/max/0/default.jpg?im=Crop%2Crect%3D%280%2C131%2C2464%2C1386%29%3BResize%3D%28620%29" title="A technician holds a culture dish with colonies of legionella in a laboratory at the Water and Environment Department at the Institut Pasteur in Lille, January 5, 2004. Seven people have died and 57 others have been diagnosed with Legionnaire&apos;s dis...