Jamestown Canyon virus is spread to people by infected mosquitoes.
Jamestown Canyon virus can be spread by many types of mosquitoes, depending on location and time of year. Mosquitoes become infected when they feed on deer and other animals that have the virus in their blood. Infected mosquitoes can then spread the virus to people and other animals by biting them. People do not develop high enough levels of the virus in their blood to infect mosquitoes and further spread the disease.
Jamestown Canyon virus is not spread by coughing, sneezing, touching, or other contact with someone who is infected.