The North Carolina Department of Health and Human Services has warned of a rise in Legionnaires' disease cases in North Carolina, with 310 cases reported in 2025, up from 201 in 2024. The disease is a severe form of pneumonia caused by Legionella bacteria, which can grow in wet environments and poorly maintained man-made water systems. Those at higher risk are adults 50 and older, current or former smokers, and individuals with weakened immune systems. Prevention measures include flushing unused faucets and maintaining proper water temperatures, ensuring adequate disinfectant levels, preventing water stagnation, and performing routine maintenance on hot tubs, fountains, and medical equipment.