Which one of the following statements is incorrect regarding the West Nile Virus (WNV)?
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1. The West Nile Virus is a mosquito-borne, single-stranded RNA virus.
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2. WNV belongs to the same family as the Japanese encephalitis virus and is a member of the flavivirus genus.
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3. The virus can spread through blood transfusions and from an infected mother to her child.
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4. Human-to-human transmission of WNV through casual contact has been widely documented.
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