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Open in a separate window. Support Center Support Center. This content does not have an English version. This content does not have an Arabic version. Overview A mosquito-transmitted virus causes most cases of West Nile infection. Request an Appointment at Mayo Clinic. West Nile virus transmission cycle Open pop-up dialog box Close. West Nile virus transmission cycle When a mosquito bites an infected bird, the virus enters the mosquito's bloodstream and eventually moves into its salivary glands.

Share on: Facebook Twitter. Show references West Nile virus. Centers for Disease Control and Prevention. Accessed Nov. Petersen LR. Epidemiology and pathogenesis of West Nile virus infection. Clinical manifestations and diagnosis of West Nile virus infection. West Nile virus infection.

Mayo Clinic; Treatment and prevention of West Nile virus infection. Tosh PK expert opinion.