According to the Centers for Disease Control and Prevention, Hantavirus is a respiratory disease that occurs when humans come into contact with fresh urine, droppings, or saliva of an infected rodent. Once Hantavirus is contracted, it can turn into Hantavirus Pulmonary Syndrome (HPS), which has a fatality rate of 38 percent. In the United States, there are no known cases in which the infection has been transmitted from one human to another. Because so little is known about the virus, it is hard to say at what time after exposure symptoms occur. According to the CDC, symptoms can show up anytime between 1-8 weeks.
Everyone who contracts HPS experiences these early stage symptoms of the disease which include fatigue, fever, and muscle aches, but only half of people who have HPS suffer these early stage symptoms: headaches, dizziness, chills, and abdominal issues such as nausea, vomiting, and diarreah. Symptoms at later stages of the disease include coughing and shortness of breath.
For more information on the Hantavirus, visit the CDC website.