Legionnaires’ disease, also known as Legionellosis, is an atypical pneumonia caused by Legionella bacteria inhaled through contaminated mist or aerosols.
Where the Bacteria Hide
Found in warm, stagnant water—cooling towers, hot tubs, air‑conditioning systems, decorative fountains, and plumbing systems.
How It Spreads
You catch it by breathing in tiny droplets contaminated with bacteria. It doesn’t pass directly from person to person.
Symptoms
Usually show up 2–10 days after exposure:– Fever (up to 40 °C or 104 °F)– Headaches, muscle aches– Cough, sometimes with blood– Shortness of breath– Chest pain, nausea, confusion
Diagnosis
– Urine test for Legionella antigen– Sputum culture from deep cough– Chest X-ray for pneumonia signs
Treatment
Antibiotics like azithromycinIV fluids & oxygen in hospitalRecovery takes weeksEarly treatment saves lives
Prevention Tips
– Clean & maintain water systems– Flush plumbing in unused buildings– Control water temps (hot above 50°C, cold below 25°C)
Final Takeaway
Legionnaires’ disease is rare but deadly.Early detection and good water system maintenance save lives.