West Nile Virus (WNV)


Study: Light-Colored Horses at Higher Risk of Dying from West Nile Virus

January 03, 2008

Researchers at the Western College of Veterinary Medicine in Saskatchewan, Canada, recently published a study indicating that light-colored horses diagnosed with West Nile virus (WNV) might be more likely to succumb to the disease than their... Read More


New Variables Identified as West Nile Risk Factors

December 22, 2007

Based on a recent retrospective study performed at the Western College of Veterinary Medicine in Saskatchewan, Canada, three major risk factors that are completely outside of a horse owner's control contribute to the mortality rate of West Nile... Read More


Two New West Nile Virus Cases in Kentucky

October 30, 2007

The Kentucky state veterinarian's office reported today (Oct. 30) that the fourth and fifth cases of West Nile virus have been identified in the state. Four of the five cases this year have survived and one was euthanatized. None of the affected... Read More


Mississippi State Reports Surge in EEE, WNV Cases

October 15, 2007

Eastern equine encephalitis (EEE) and West Nile virus (WNV) have hit Mississippi's horses hard this year, with EEE case numbers surging to more than double 2006 levels. According to State Veterinarian Jim Watson, DVM, there have been 27 cases of... Read More


Understanding West Nile Virus

October 02, 2007

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Wisconsin Horse Positive for West Nile Virus

September 29, 2007

A Racine County, Wisconson, horse has tested positive for West Nile virus. The Caledonia and Mount Pleasant Health Department says it's the first documented case this year of the mosquito-borne disease in Racine County. Health officer Margaret... Read More


WNV: Montana, California Leading Country in Equine Cases

September 19, 2007

As of September 11, Montana and California had reported the highest number of equine West Nile virus (WNV) cases so far this year with 24 and 19, respectively. The USDA's Animal and Plant Health Inspection Service tracks equine arboviruses... Read More


Equine West Nile Virus Case Reported in Kentucky

September 15, 2007

A 10-year-old Quarter Horse gelding is Kentucky’s first West Nile virus (WNV) case of 2007, according to Rusty Ford, Equine Programs manager with the Kentucky State Veterinarian's office.

The horse is from Mason County. He was not vaccinated,... Read More


UC Davis: Gene Mutation Turned WNV into Killer Disease among Crows

August 21, 2007

A gene mutation that appears to be responsible for changing relatively mild forms of the West Nile virus into a highly virulent and deadly disease in American crows has been identified by a team of scientists led by a researcher at the Universit... Read More


WNV, EEE Found in Massachusetts Mosquitoes

August 10, 2007

The Massachusetts Department of Public Health (MPH) announced Aug. 10 that Eastern equine encephalitis (EEE) virus and West Nile virus (WNV) have been detected in mosquitoes in Bristol, Norfolk, and Suffolk counties.

According to the MP... Read More


West Nile Virus Claims South Dakota Horse

August 05, 2007

West Nile virus has killed a horse in Meade County, S. D.

This is South Dakota's first horse fatality from the disease since 2005,... Read More


California Declares WNV Emergency in Three Counties

August 03, 2007

Gov. Arnold Schwarzenegger declared a state of emergency Thursday in three California counties hit hard by the mosquito-borne West Nile virus, which has killed four people this year... Read More


Oklahoma Horse Owners Urged to Vaccinate Animals Against WNV

July 28, 2007

Oklahoma state veterinarians are encouraging horse owners to have their animals vaccinated against the potentially deadly West Nile virus.

The virus is carried by mosquitoes and officials say because of the rainy summer mosquitoes are... Read More


Two Montana Horses Contract WNV

July 28, 2007

Montana's acting state veterinarian says West Nile virus has been confirmed in horses in Blaine and Phillips counties.

Jeanne Rankin says neither of the two horses was vaccinated against the disease; and both are still alive.

The... Read More


CDC: Human West Nile Virus Cases Off to a Fast Start

July 27, 2007

The nation is on pace to have its worst West Nile virus (WNV) season in years, federal health officials said Thursday (July 26).

"If this trend continues like this, it's going to be a very high," said Dr. Lyle Petersen of the U.S.... Read More


Equine Cases of EEE and WNV Confirmed in Virginia

July 26, 2007

Virginia's state veterinarian confirmed on Wednesday (July 24) the first cases of Eastern equine encephalitis (EEE) and West Nile virus (WNV) in horses this year. The EEE-positive horse was from Suffolk and was euthanatized because of its illnes... Read More


Texas: Water Everywhere Raises Risk of Livestock Disease

July 16, 2007

Rushing water, stagnant ponds, or even sudden dry stages after wet periods can lead to outbreaks of livestock disease. Mosquitoes and biting flies, capable of carrying and transmitting diseases, thrive in the damp weather. Prolonged... Read More


Flooded Plains States: Drying Out, Bracing for Mosquito-Borne Equine Diseases

July 12, 2007

The waters might be receding, but horse owners in Kansas, Oklahoma, Texas, and other areas affected by recent flooding shouldn't drop their guard against flood-related problems just yet. Veterinary authorities say owners in the soggy states... Read More


West Nile Virus Found in New Mexico Horse

July 04, 2007

A horse in Lea County, N.M., has been confirmed with the West Nile virus, a mosquito-borne illness that also can strike humans.

It was the first case in a horse in New Mexico this year, the state Department of Health said. There have bee... Read More


West Nile Virus Showing Up Across the Country

July 01, 2007

With some areas of the country having excess rainfall, and many parts moving into prime West Nile virus season, many government officials are warning humans to take precautions against the deadly disease.

West Nile virus cases in humans... Read More


Researchers Test WNV Vaccines

June 30, 2007

In a recent study, University of Florida researchers evaluated the effectiveness of three commercially available equine West Nile virus (WNV) vaccines. While all vaccinated horses, irrespective of the vaccine administered, did not develop viremi... Read More


West Nile Virus Detected in Idaho

June 16, 2007

West Nile virus (WNV) has been found in mosquitoes in southwest Idaho, the Idaho Department of Health and Welfare reported.

Mosquitoes in Gem County tested positive for the virus June 8. It is the first time this year the virus has been... Read More


WNV: Pennsylvania Reports First Positive Mosquito of 2007

June 12, 2007

Pennsylvania state officials reported June 12 that the first mosquito sample positive for the West Nile virus in the state this year has been found in Blair Township, Blair County.

"As with people, animals become infected with the West Nile... Read More


West Nile Virus Appearing in Washington Horses

June 08, 2007

In 2002, Washington confirmed its first two equine cases of West Nile virus (WNV) in Pierce and Thurston counties. The disease was not seen again until 2005, when one positive horse was found in Yakima County. In 2006, six cases were confirmed,... Read More


WNV: Some East Coast Bird Populations Wiped Out

May 31, 2007

Birds that once flourished in suburban skies, including robins, bluebirds and crows, have been devastated by West Nile virus, a new study has found.

Populations of seven species have suffered dramatic declines across the continent since Wes... Read More