Hantavirus is a group of viruses primarily spread to humans through contact with infected rodents, their urine, droppings, or saliva. Infection can cause serious illnesses such as Hantavirus Pulmonary Syndrome, which affects the lungs and can lead to breathing difficulties. Symptoms often begin with fever, fatigue, muscle aches, and headaches before progressing to more severe respiratory problems. Preventing exposure to rodents and maintaining clean living environments are key ways to reduce the risk of infection.