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Officials last week started aerial spraying for mosquitoes in Dallas County. But it’s too soon to measure the effect — it takes from 3 to 14 days for people to develop symptoms after being infected by a mosquito.

The best way to prevent West Nile disease is to avoid mosquito bites. Insect repellents, screens on doors and windows, and wearing long sleeves and pants are some of the recommended strategies. Also, empty standing water from buckets, kiddie pools and other places to discourage breeding.