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Utah Department of Agriculture
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Situations
West Nile virus animal infections
4 clusters · 16 sources · last updated
Latest: West Nile virus detected in mosquito samples in Boston and Montana
In early August 2026, Germany reported a surge of West Nile virus cases in horses, linked to unusually wet weather that boosted mosquito and tick populations. The virus, first seen in European birds in the 1960s and in G