AUSTIN, Texas — Officials in the southwest U.S. state of Texas are tracking the spread of the West Nile virus, which has killed 21 people in the state so far this year and has sickened nearly 700. While the Dallas metropolitan area has had the most cases, the disease is cropping up all across the state. Technicians in the state's mosquito laboratory are examining mosquito corpses sent from all over Texas, at the Texas Department of Health Services Laboratories in the capital of ...
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