If a Charleston County woman hadn't donated blood, she may not have learned she had West Nile Virus, the first case in South Carolina this year.
The state Department of Health and Environmental Control says all donated blood is routinely screened for WNV to ensure the safety of the blood supply.
WNV is a bird disease that is carried by mosquitoes to people and animals.
People bitten by an infected mosquito may become ill within 2 to 14 days with flu-like symptoms, including fever, headache, joint pain, muscle pain, and occasionally nausea and vomiting. Often they experience sensitivity to light and inflammation of the eyelids. Some may have a rash.
"The most important step anyone can take to prevent West Nile virus infection is to protect against being bitten by a mosquito," said Linda Bell, M.D., Interim State Epidemiologist. "The risk of serious illness is low. Less than one percent of people infected develop a potentially fatal swelling of the brain, known as encephalitis."
So far this year in South Carolina, in addition to the person from Charleston County, WNV has been detected in one dead crow, one horse, and one mosquito pool.
DHEC recommends citizens pay attention to the "four Ds" as the most effective ways to prevent WNV:
DEET - Apply insect repellent containing DEET, picaridin, oil of lemon, eucalyptus, or IR 3535 according to label instructions. Repellents help keep mosquitoes from biting. DEET can be used safely on infants and children 2 months of age and older.
DRESS - Wear clothing that reduces the risk of skin exposure.
DAWN AND DUSK - Exposure to mosquitoes is most common during the early morning and evening so it is important to wear repellent at that time. Make sure that your doors and windows have tight-fitting screens to keep out mosquitoes.
DRAIN - Mosquitoes lay their eggs on standing water. Eliminate all sources of standing water on your property, including flowerpots, old car tires, rain gutters and pet bowls. If you have a pond, use mosquito fish (available from your local mosquito and vector control agency) or commercially available products to eliminate mosquito larvae.
For more information about WNV, visit http://www.scdhec.gov/environment/envhealth/pests/mosquitoes-wnv.htm