What are the Symptoms of Legionella?

Legionella is a type of bacterium that can cause a severe form of pneumonia known as Legionnaires’ disease, as well as a milder flu-like illness called Pontiac fever. Symptoms of these conditions can vary in severity, but Legionnaires’ disease is generally more severe. Common symptoms of Legionnaires’ disease and Pontiac fever include:

  1. Legionnaires’ Disease:
    • High Fever: Often exceeding 102°F (39°C) to 105°F (40.5°C).
    • Cough: Initially a dry cough, which may later produce phlegm or mucus.
    • Shortness of Breath: Difficulty in breathing or rapid breathing.
    • Chest Pain: Pain or discomfort in the chest, especially when breathing deeply or coughing.
    • Muscle Aches: Generalized body aches, muscle pain, and fatigue.
    • Headache: Severe headaches are common.
    • Chills: Shivering and feeling cold, despite a high fever.
    • Fatigue: Profound weakness and fatigue.
    • Loss of Appetite: A decrease in appetite and weight loss.
    • Confusion: Mental confusion or disorientation, especially in severe cases.
    • Nausea and Vomiting: Some individuals may experience gastrointestinal symptoms.
    • Diarrhea: Occasional gastrointestinal symptoms like diarrhea may occur.
  2. Pontiac Fever:
    • Fever: High fever similar to Legionnaires’ disease.
    • Muscle Aches: Generalized muscle aches and pain.
    • Headache: Severe headaches or migraines.
    • Fatigue: Profound weakness and fatigue.
    • Chills: Shivering and feeling cold, despite a high fever.
    • Non-productive Cough: A dry cough may also be present.

Pontiac fever is generally less severe than Legionnaires’ disease and does not cause pneumonia. Symptoms usually appear 24 to 72 hours after exposure to the Legionella bacteria and can last for several days to a week. The severity of symptoms may depend on various factors, including an individual’s overall health, age, and the presence of underlying medical conditions.

Legionella bacteria are commonly found in water sources, such as hot tubs, air conditioning systems, water heaters, and large plumbing systems. Inhaling droplets or mist contaminated with the bacteria can lead to infection. If you suspect exposure to Legionella or experience symptoms resembling Legionnaires’ disease or Pontiac fever, seek medical attention promptly for appropriate diagnosis and treatment.