A quarter horse near Spokane, Wash., is improving after it was diagnosed with the virus.
A dead bird in Walnut Creek and a group of mosquitoes from Byron in East Contra Costa County have tested positive for West Nile virus, the Contra Costa Mosquito and Vector Control District confirmed Thursday.
Most people infected with West Nile virus do not get sick.
"West Nile is a serious illness spread by mosquitoes in Los Angeles County", said Dr. Jeffrey Gunzenhauser, the county's interim health officer, in a statement Thursday. Horse owners should also consult their private practicing veterinarian to determine an appropriate disease prevention plan for their horses.
The one known victim is a man from Crete, Casey said.
The CDC says about one in five people who are infected develop a fever with other symptoms such as headache, body aches, joint pains, vomiting, diarrhea, or rash.
So far this year, four probable or confirmed human cases of West Nile have been reported in the entire province of Ontario. Of those, seven horses died or were euthanized. This is the first detection of the virus in Grant County this season and the 11th positive mosquito sample statewide in 2017.
The first confirmed human case in IL in 2017 was a man in his 60s from southwest suburban Will County, diagnosed in late June.
More than 30 cases have been reported in some years, Louisell said.
Vaccines in horses have proven to be a very effective prevention tool.
Eliminate sources of standing water around your home like pails, old tires, wading pools and bird baths that serve as breeding areas for mosquitoes.
As temperatures rise in midsummer, so do concerns over the threat posed by the West Nile vir...