Hantavirus Pulmonary Syndrome (HPS) is a severe, sometimes fatal, respiratory disease in humans caused by Sin Nombre Viruses from the family Bunyaviridae. The host of the Sin Nombre virus is the deer mouse (Peromyscus maniculatus). Early symptoms include fatigue, fever and muscle aches, especially in the large muscle groupsthighs, hips, back, and sometimes shoulders. There may also be headaches, dizziness, chills, and abdominal problems, such as nausea, vomiting, diarrhea, and abdominal pain.