Indoor Air sciences CSMI Practice Exam

What type of agent is responsible for causing Legionnaires Disease?

1. Bacteria

2. Virus

3. Fungi

4. Protozoa

The correct answer is: Bacteria

Legionnaires' Disease is caused by a specific type of bacteria known as Legionella. This bacterium can be found in freshwater environments, like lakes and rivers, but it can also thrive in human-made systems, such as hot water tanks, cooling towers, and large plumbing systems. When individuals inhale aerosolized water droplets containing the bacteria, they can contract the disease, which presents with symptoms similar to pneumonia. Understanding the biological nature of Legionnaires’ Disease is crucial for effective prevention and control measures. For instance, maintaining appropriate water temperature and disinfecting water systems can significantly reduce the risk of bacterial proliferation. Knowledge of the specific agent is essential for healthcare professionals as it guides diagnosis and treatment, which typically includes the use of antibiotics targeted at bacterial infections.