Pulmonary legionellosis has an incubation period of 2 to 14 days, that is, symptoms of the disease appear 2 to 14 days after exposure to the bacteria. Legionella pneumophila.

The first symptoms of legionellosis are like those of the flu.

• Fever.
• Headaches.
• Chills.
• Muscle pain.
• A deterioration of the general condition or lethargy.

After a few days, some people may have:

• A cough with sputum containing blood.
• Chest pain.
• Loss of appetite.
• Shortness of breath.
• Gastrointestinal problems such as diarrhea, nausea or vomiting.
• A confusion.