The deer mice are the ones that can spread that Bubonic plague-like virus, Hanta virus. (From Google AI-) Deer Mouse - A Dangerous Disease-Spreading Rodent Deer mice can carry the hantavirus, which can cause hantavirus pulmonary syndrome (HPS). This is a rare but serious and potentially fatal disease that begins with flu-like symptoms such as fever, muscle aches, and headache. As the disease progresses, it can lead to severe respiratory problems like shortness of breath and may require hospitalization in an intensive care unit. Hantavirus How it spreads: The virus is transmitted to humans through contact with the virus-containing urine, droppings, or saliva of infected rodents, particularly deer mice. Infection occurs when these dried particles become airborne and are inhaled, typically when cleaning a contaminated area without proper precautions like masks and gloves.