The virus spreads by mosquitoes that become infected when they bite birds carrying the virus. When an infected mosquito then bites a person or animal, the virus is injected through the mosquito's saliva into the bite wound.
In addition, four novel (non-mosquito) modes of transmission have been documented: through the placenta ...
The virus spreads by mosquitoes that become infected when they bite birds carrying the virus. When an infected mosquito then bites a person or animal, the virus is injected through the mosquito's saliva into the bite wound.
In addition, four novel (non-mosquito) modes of transmission have been documented: through the placenta from mother to baby, through breast-feeding, through the transplantation of infectious organs, and through transfusion of infectious blood products.
Learn more about how the West Nile virus spreads.
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