In recent years, sporadic cases have been found in several eastern states. Studies have shown that mice are often infected and appear to be the source of infection. Hantavirus infections are rare. No one believes the virus will start an epidemic, but sporadic or isolated cases may occur throughout the country. The virus is carried by rodents such as mice which are found throughout North America.
Infected rodents shed the live virus in saliva, droppings and urine.
Humans are infected when they inhale microscopic particles that contain rodent urine or droppings. Insect bites and pets are not believed to play a role in Hantavirus transmission. No health care workers have been infected while caring for infected persons. Typical symptoms include high fever, muscle aches, cough and headache. After several days, respiratory problems worsen rapidly.