The time from infection with the hantavirus to the start of illness is usually about 2 to 3 weeks. Hantavirus pulmonary syndrome advances through two distinct stages. In the first stage, which can last for several days, the most common signs and symptoms are: 
Fever and chills
Muscle aches or pain
Headache
 Some people also experience: 
Nausea
Stomach pain
Vomiting
Diarrhea
 As the disease progresses, it can lead to damaged lung tissues, fluid build-up in the lungs, and serious problems with lung and heart function. Signs and symptoms may include: 
Cough
Difficulty breathing
Low blood pressure
Irregular heart rate
