Simple steps can reduce risk of serious mosquito-borne illnesses
PORTLAND, Ore.—As mosquito activity increases during the summer months, Oregon Health Authority (OHA) is reminding residents and visitors to take precautions against mosquito bites and reduce exposure to West Nile virus, the most common mosquito-borne disease in the state.
Mosquitoes carrying West Nile virus are detected in Oregon every year, primarily in eastern and southern parts of the state, though infected mosquitoes have been found throughout the Pacific Northwest. Public health works closely with local vector control districts to identify areas where the virus is circulating in the mosquito population.
West Nile virus is primarily spread through the bite of an infected mosquito. The virus can infect humans, birds, horses and other animals. Mosquitoes become infected after feeding on infected birds and can then spread the virus through subsequent bites.
“Summer is a great time to enjoy Oregon’s outdoors, but it’s also the time of year when mosquito activity is at its highest,” said Emilio DeBess, D.V.M., public health veterinarian at OHA’s Public Health Division. “Most people infected with West Nile virus may not develop symptoms, but some can become seriously ill, especially those over 50. Taking a few simple precautions can significantly reduce your risk.”
About one in five people infected with West Nile virus develop a fever and flu-like illness that can include headache, body aches, joint pain, vomiting, diarrhea or rash. Adults 50 and older, people with weakened immune systems, and those with certain underlying health conditions are at greater risk for severe illness. In rare cases, the virus can cause severe neurological disease affecting the brain or nervous system.
People experiencing a high fever, severe headache, stiff neck, confusion, muscle weakness, tremors or paralysis should contact a health care provider right away.
Here are tips to reduce breeding sites at home:
- Eliminate standing water around potted plants.
- Empty water from buckets, birdbaths, pet dishes and other containers at least once or twice each week.
- Clean clogged gutters and drainage areas.
- Remove old tires, unused containers and outdoor debris that can collect water.
- Regularly inspect areas under decks and shrubs, and around outbuildings where water may accumulate.
Tips to protect yourself outdoors:
- Use an EPA-registered insect repellent and follow label instructions.
- Wear long-sleeved shirts, long pants and socks when mosquito activity is high.
- Consider limiting outdoor activities during dawn and dusk, when mosquitoes are most active.
- Use mosquito netting over infant carriers and strollers.
- Repair or install window and door screens to keep mosquitoes out of homes and buildings.
Additional information about West Nile virus, mosquito prevention and surveillance activities in Oregon is available on OHA’s West Nile virus webpage.
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