Legionnaires Disease is a form of Pneumonia that is caused by Legionella bacteria. It can only be contracted by aspirating infected water vapor and can be fatal is left untreated.
The risk of death from Legionnaires Disease is higher for those who are infected while already in a hospital or for those with chronic diseases.
Symptoms typically appear 2-10 days after exposure. Treatments for Legionnaires Disease use antibiotics to fight the symptoms and breathing assistance from a ventilator may be required.