Initially,<unk>  has an incubation phase of 2–4 weeks, in which patients remain asymptomatic. Subsequently, patients can experience 3–5 days of flu-like prodromal phase symptoms, including fever, cough, muscle pain, headache, lethargy, shortness of breath, nausea, vomiting and diarrhea. In the following 5–7 day cardiopulmonary phase, the patient's condition rapidly deteriorates into acute respiratory failure, characterized by the sudden onset of shortness of breath with rapidly evolving<unk>  edema, as well as cardiac failure, with hypotension, tachycardia and shock. In this phase, patients may develop acute respiratory distress<unk> . It is often fatal despite mechanical ventilation and intervention with diuretics. After the cardiopulmonary phase, patients can enter a diuretic phase of 2–3 days characterized by symptom improvement and diuresis. Subsequent convalescence can last months to years. As of 2017, patient mortality in the USA from<unk>  is 36%.
Hantavirus pulmonary syndrome
Idiopathic pneumonia syndrome
Fungal pneumonia
Community-acquired pneumonia
Viral pneumonia
Influenza 
Influenza
Parasitic pneumonia