Final answer:
Legionnaires' Disease is an atypical pneumonia caused by the Legionella pneumophila bacterium. To avoid an outbreak, it is essential to maintain and clean reservoirs, disinfect water systems, and ensure proper ventilation.
Step-by-step explanation:
Legionnaires' Disease is an atypical pneumonia caused by a bacterium called Legionella pneumophila. It is primarily transmitted through inhalation of aerosols containing the bacteria, which can come from human-made reservoirs such as air-conditioning cooling towers or humidifiers. To help avoid an outbreak of this disease, it is important to properly maintain and clean these reservoirs, as well as regularly disinfecting water systems and ensuring proper ventilation in enclosed spaces.