First West Nile case of 2026 hits Colorado as officials warn even small pools of backyard water can breed infected mosquitoes

• Colorado reports its first West Nile virus infection of 2026 in a Jefferson County resident.

Colorado’s first confirmed West Nile virus infection of 2026 has now been reported.

Public health authorities in Jefferson County said the infected person is a county resident.

Officials are warning residents to watch for water that collects around their homes, since even tiny amounts can give mosquitoes a place to breed…

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