(Santa Ana, CA) — An Anaheim resident over the age of 80 has tested positive for West Nile virus (WNV), marking the first confirmed human WNV case in Orange County this year. The person experienced headache and neurologic symptoms and was hospitalized with encephalitis, a serious brain inflammation linked to the virus. Orange County reported just one human case of West Nile virus and no related deaths in 2024.
“West Nile virus is common in Orange County, recurring every year during the summer months and continuing into the fall,” said Dr. Regina Chinsio-Kwong, County Health Officer. "The best way to avoid West Nile virus infection is to take precautionary measures to avoid mosquito bites.”
Recommended WNV precautions include:
• Emptying all standing water on your property to reduce areas in which mosquitoes may breed, including flowerpot saucers and pet bowls.
• Making sure your window and door screens are in good condition.
• Using insect repellent containing DEET, picaridin, oil of lemon eucalyptus, or products containing IR3535, always following label directions.
• Limiting outdoor activity at dawn and dusk when mosquitoes are most active.
• Wearing long-sleeved shirts and long pants when outdoors.
Most people who become infected with WNV do not experience symptoms. However one in five may develop fever and may have headache, body aches, nausea, tiredness and sometimes a skin rash. In rare cases, WNV can lead to serious complications such as encephalitis (inflammation of the brain). Symptoms of severe illness may include: severe headaches, neck stiffness, confusion, muscle weakness or paralysis. Anyone experiencing these symptoms should seek immediate medical care. People over 50 years of age and those with certain medical conditions are at higher risk of serious illness from WNV infection.
Information on mosquito control is available on the Orange County Mosquito and Vector Control District’s website at www.ocvector.org. Other websites with helpful information about WNV include:
• Centers for Disease Control West Nile Virus
• California Department of Public Health West Nile Virus
• OC Health Care Agency West Nile Virus
ABOUT THE OC HEALTH CARE AGENCY
The OC Health Care Agency (HCA) is a regional interdisciplinary health jurisdiction and an accredited health department, charged with protecting and promoting individual, family and community health through partnership and coordination of public and private sector resources. Visit www.ochealthinfo.com to learn more about services and resources.
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