Officials are raising new concerns over West Nile virus as researchers have found mosquitoes are becoming immune to insecticides. NBC News’ Erika Edwards goes inside a Centers for Disease Control lab where they’re studying the insects.
Nine cases of West Nile virus have been confirmed so far this year, as disease experts say the virus appears to be circulating more than usual for this time of summer. As of June 25, the Centers for Disease Control and Prevention had confirmed human cases in at least seven states: Arizona, Arkansas, Kansas, Maryland, Michigan, Mississippi and Tennessee. At least 18 states have detected the virus this year in humans, mosquitoes, birds or other animals.
The CDC’s tally for West Nile cases this year is likely an undercount, since several states have reported additional human cases in recent weeks. The Southern Nevada Health District recorded seven cases since June 26, five of which were announced Wednesday. Four of the total cases were neuroinvasive. According to the health district, more than 8,000 mosquitoes in Southern Nevada had tested positive for West Nile as of June 27.
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