DOVER (September 3, 2021) – The Division of Public Health (DPH) announced today that a 69-year-old Kent County man has become infected with West Nile Virus (WNV), the state’s first case of human WNV since 2018, when 10 human WNV cases were reported, including two deaths from the illness. An epidemiological investigation is currently ongoing to confirm any travel history or sources that could have led to transmission. To protect the patient’s privacy, no more information will be provided on the individual at this time.
“We’re sad to learn that a case of West Nile Virus has been reported in Delaware,” said DPH Director Dr. Karyl Rattay. “West Nile Virus can be very serious and even deadly, particularly in vulnerable populations. Please take all proper precautions when going outdoors and there is a possibility of being bitten by mosquitoes, like wearing insect repellent, especially if you are among a vulnerable population.”
The mosquitoes that cause WNV bite primarily from dusk (evening) to dawn (morning). However, other mosquitoes that cause diseases such as chikungunya, dengue fever, and Zika can bite during the day. It is important to protect yourself by wearing insect repellent whenever you go outdoors.
WNV is a mosquito-borne illness that can cause serious health problems. WNV is transmitted by mosquitoes, generally in summer and fall, with a peak period for disease transmissions from mid-August to mid-October. Nearly 80 percent of people infected with WNV will not become ill. While only a little less than 20 percent of those infected with the virus will develop West Nile fever with mild symptoms (fever, headache, body aches, a skin rash on the chest or back and swollen lymph glands), one in 150 people infected will develop severe infection (West Nile encephalitis or meningitis).
Symptoms of severe WNV infection include headache, high fever, stiff neck, and/or tremors and muscle weakness. The elderly and those with weakened immune systems are most at risk. Anyone who experiences any of these severe symptoms should seek medical help immediately. Symptoms may progress to stupor, disorientation, coma, convulsions, paralysis and possibly death.