WNV Case Definition

"Probable," "presumptive," "suspected," and "confirmed." All of these words are used to describe equine disease cases tested for West Nile virus (WNV). The cases are "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 different sources of

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