Las Vegas and all of Southern Nevada have a large mouse population. When most people hear the term rodent-borne disease the first thing to come to mind are the likes of Hantavirus, plague, rat-bite fever and salmonellosis. However, there’s another rodent-borne viral infectious disease people should be aware of as we enter the winter season — Lymphocytic choriomeningitis, or LCM, which is caused by lymphocytic choriomeningitis virus (LCMV). LCVM is transmitted to humans following exposure to fresh urine, droppings, saliva, or nesting materials from infected house mice. Individuals who are bit by an infected rodent may also be at risk of exposure.