Generally, WNV is spread by the bite of an infected mosquito. Mosquitoes are WNV carriers that become infected when they feed on infected birds. Infected mosquitoes can then spread WNV to humans and other animals when they bite.
Transfusions, Transplants & Mother-to-Child
In a very small number of cases, WNV also has spread through blood transfusions, organ transplants, breastfeeding, and even during pregnancy from mother to baby.
Not Through Touching
WNV is not spread through casual contact such as touching or kissing a person with the virus.