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Mosquitoes vanish across half the US — but West Nile virus hits 22-year high

Mosquito populations have dropped by 50% across Western and Midwest US states, a decline that has scientists alarmed rather than relieved. At the same time, West Nile virus cases have reached a 22-year high, deepening the mystery. Experts warn the crash in insect numbers could signal broader ecosystem disruption and environmental change.

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