"It could have come from anywhere in the county".
Dr. Robert Levin, health officer with Ventura County Public Health, says that it's likely that 2018's first patient contracted the illness outside of the county.
The goal of the sprayings is to control the population of adult mosquitoes and reduce the risk of spreading Mosquito-Borne Viruses throughout the area.
Kentucky, she said, has a relatively low level of activity compared to the neighboring state of OH, which has had about 300 confirmed bird infections.
So far no cases of West Nile have been found in Mesa County but they have in Weld, Boulder, Larimer, and Delta counties.More news: What Google changed in its location-tracking explanation
The recent discovery of a dead crow found in Oneida county has prompted an alert from the Oneida County Health Department.
The good news - there are no reported human cases.
"We like to stress we have a much different environment than Louisiana or MS, which have wetlands", Billings said. Bti is a naturally-occurring soil bacterium that biodegrades quickly and kills mosquito and blackfly larvae, but is safe for people, pets, aquatic life and plants.
Kentucky's drier climate and colder winters reduce mosquito activity here.
VDACS said in the news release that the horse was unvaccinated.More news: Hazard: Chelsea 'can do something magic' under Sarri
Humans and horses are "dead-end hosts" and can not transmit the virus, said Billings.
Here is a list of things you can do to reduce the risk of being bitten by mosquitoes.
DEET is the shortened form of a chemical developed by the Army in 1946 and is contained in the most effective and popular insect repellents.
"One of the most important things people can do is prevent standing water", Billings said. West Nile virus, for which there is no known cure or vaccine, remains a serious threat, officials said. The incubation period for WNV (the period between being bitten by an infected mosquito and showing the first symptoms) varies from 3-15 days.
Accidental exposure is not expected to cause any health concerns in most people, and no precautions are needed the day after the application, as all residues will have evaporated.More news: Fiji natural disaster : 8.2 quake triggers tsunami fears in Pacific 'Ring of Fire'
Once infected, a person's body does build an immunity to the virus, said Stump. West Nile attacks the central nervous system and usually results in mild flu-like symptoms or no symptoms at all.