Confirmation came late Friday afternoon.
LeMaster also could not say with certainty how the person contracted the virus, since knowing which particular mosquito bit someone is impossible.
"It's not like dogs, (where) you identify the dog that bit you," she said.
Others in Berkeley County also are being tested, but LeMaster said the results are not back.
News that someone has the virus, along with all the recent rain, means people again need to follow certain precautions. Infected mosquitoes carry the virus and can spread it by biting a human, animal or bird. Several birds throughout the region have tested positive for the virus.
When outside in areas with mosquitos, people need to wear long-sleeved shirts, pants and head netting if necessary, LeMaster said.
Eliminating mosquito breeding grounds - standing water - is crucial. People should make sure they do not have tires, buckets, toys, bird baths, decorative fountains or other items with stagnant water. Cleaning gutters and keeping pool water treated and circulating is important, LeMaster said.
Repellents used should contain DEET, she said.
Do not open a window if it does not have a screen. Screens that are in place should be free of holes, she said.
Although West Nile is more common in people over age 50, younger generations should not ignore the possibility of infection. They, too, are at risk, she said.
Most infected people never show any symptoms, although others experience fever, headaches or body aches. Anyone who suspects infection should seek medical attention, LeMaster said.
