The Health Department says most people who are infected do not become sick, but about 20 percent develop flu-like symptoms.
While 25 people have been killed across the country as of September 4, some 262 people were affected by the fever, a statement said.
The Clark County Health Department will continue to collect and test mosquitoes, as well as spray pesticides until the year's first freezing temperatures.
The chance of getting seriously ill or dying from West Nile is low, according to the DHEC statement. The disease can not be transmitted between animals and humans. In rare cases, the illness can be serious and even fatal.
In late August, Columbia officials found a bird which later tested positive for the disease.
DAWN AND DUSK - Mosquitoes that transmit West Nile Virus usually bite in the early morning and evening so it is important to wear proper clothing and repellent if outside during these times.
Symptoms of the West Nile virus tend to appear two weeks after infection, and include fever, fatigue, nausea, vomiting and headaches.
Through a news release the ISDH provided the following steps to help residents reduce the threat of West Nile virus in their area.
The Regional Municipality of York consists of nine local cities and towns, and provides a variety of programs and services to 1.2 million residents and 51,000 businesses with 620,000 employees.