Hantavirus? Things you should know Warning Transmitted primarily by inhaling aerosolized virus particles from rodent urine, droppings, or saliva, they cause symptoms like fever, muscle aches, and rapid respiratory failure. Early symptoms include fever, muscle aches, and fatigue. These can progress to severe cardiopulmonary symptoms (shortness of breath) or acute renal failure. The best defense is avoiding rodents, cleaning up infested areas with disinfectants (using masks and gloves), and sealin