The duration of hantavirus illness depends on the type and severity of the infection. The incubation period may range from several days to several weeks. Mild cases may gradually improve with supportive care, but severe cases may require hospitalization or intensive care. Recovery can take longer when the lungs or kidneys are involved. Therefore, it is not accurate to give a single fixed number of days for all hantavirus infections. If fever, muscle pain, shortness of breath, or reduced urination develops after possible rodent exposure, medical evaluation should be sought rather than waiting for symptoms to pass on their own.