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July 25, 2013
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West Nile found in mosquitoes in Douglas County

Mosquitoes that have tested positive for West Nile Virus have been found north of Genoa in Carson Valley, according to the Douglas County Mosquito Abatement District.

“We are taking action tonight with a ground adulticiding attack followed by an aerial adulticiding application early Thursday morning,” District Manager Krista Jenkins said. “We strongly advise people to wear long sleeve shirts and pants in the early morning and evening hours and to use an insect repellent with Deet. We will continue to monitor the area. Trapping for mosquitoes will occur after the adulticide applications and sent into the state for testing.”

The Nevada Department of Agriculture’s Animal Disease and Food Safety Laboratory identified its first positive West Nile Virus sample collected in northern Nevada this year.

In September, the Nevada State Health Division reported one human case associated with West Nile Virus that involved a Churchill County resident over the age of 50 with the neuroinvasive or more severe form of the illness.

Clark County has already reported human cases of West Nile Virus.

More than 700 samples from statewide surveillance have been submitted to the laboratory at the Department’s Sparks office since May.

“All horse owners should update their animal’s West Nile Virus vaccination,” said Dr. Annette Rink, acting state veterinarian and supervisor of the Animal Disease and Food Safety Laboratory.

Four effective vaccines exist for horses, but vaccine development for humans is still under way with currently no available product in sight.

The potentially serious disease first appeared in Nevada in 2004, affecting people horses and relatives of the magpie. It flares up in summer when mosquitoes are at their height and continues into the fall.

If infected with West Nile, people will experience symptoms within three to 14 days after being bitten, as stated by the Centers for Disease Control.

One in 150 people infected develop severe symptoms, up to 20 percent develop mild symptoms and about 80 percent experience no symptoms at all, according to the CDC website. Individuals older than 50 are more likely to experience severe symptoms, but many healthy people also become ill.

Severe symptoms can last several weeks and result in permanent neurological effects. The symptoms include high fever, headache, neck stiffness, stupor, disorientation, coma, tremors, convulsions, muscle weakness, vision loss, numbness and paralysis as reported by the CDC. Individuals experiencing any of these symptoms should be admitted to a hospital.

Mild symptoms usually last a few days and include fever, headache, body aches, nausea, vomiting and sometimes swollen lymph glands or a skin rash on the chest, stomach and back, according to the website. These symptoms will go away on their own.

To report a mosquito area in need of adulticide or larvicide, call 423-2828. For information, visit

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The Nevada Appeal Updated Jul 26, 2013 03:33PM Published Jul 25, 2013 06:43PM Copyright 2013 The Nevada Appeal. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.