West Nile Virus Case Definition

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“Probable,” “presumptive,” “suspected,” and “confirmed.” All of these words are used to describe equine cases tested for West Nile virus (WNV). The cases might be “confirmed” on a local, state, or national level. What do these descriptions mean, and why don’t the totals reported by state and national agencies always match?

“It is easy to get confused about what

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