Final answer:
The diagnosis of West Nile virus infection is through detection of a rise in neutralizing antibody in a patient's serum. PCR analysis from saliva samples can also be used for diagnosis.
Step-by-step explanation:
Diagnosis of West Nile virus infection is through detection of a rise in neutralizing antibody in a patient's serum. PCR analysis from saliva samples is also used for diagnosis. However, viral growth in cell cultures and culture on artificial media are not commonly used for diagnosis of West Nile virus infection.