California Dept. of Public Health confirms first human West Nile Virus illness of 2018
Four West Nile Virus illnesses confirmed in Kern, Los Angeles and Riverside counties
SACRAMENTO – The weather is getting warmer and will soon reach scorching temperatures for the next few months. Unfortunately, with the added temperature spike comes the increase of West Nile Virus (WNV) vectors, most notably mosquitoes. Already, the California Department of Public Health (CDPH) announced last week four confirmed cases of WNV.
“West Nile virus activity in the state is increasing, so I urge Californians to take every possible precaution to protect against mosquito bites,” said CDPH Director and State Public Health Officer Dr. Karen Smith. Cases were located in Kern, Los Angeles and Riverside counties.
Kern County, which shares the southern border of Tulare County, is nearly identical in climate. With a case so close to Tulare County residents should beware of the dangers of WNV.
West Nile virus is transmitted to humans and animals by the bite of an infected mosquito. As of June 8, 2018, WNV has been detected in 14 dead birds from seven counties and four mosquito samples from three counties. Hot temperatures this month are contributing to increasing numbers of mosquitoes and the increased risk of virus transmission to humans. So far this season, activity is within expected levels. The risk of disease due to WNV usually increases at this time of year and is highest throughout the summer and early fall.
West Nile virus is influenced by many factors, including climate, the number and types of birds and mosquitoes in an area, and the level of WNV immunity in birds. The risk of serious illness to most people is low. However, some individuals – less than one percent – can develop serious neurologic illnesses such as encephalitis or meningitis. In 2017, there were 553 reported WNV cases in California, including 44 deaths.
People 50 years of age and older, and individuals with diabetes or hypertension, have a higher chance of getting sick and are more likely to develop complications from WNV infection.
CDPH recommends that individuals protect against mosquito bites and WNV by practicing the “Three Ds”:
1. DEET – Apply insect repellent containing DEET, picaradin, oil of lemon eucalyptus or IR3535 according to label instructions. Repellents keep the mosquitoes from biting you. Insect repellents should not be used on children under two months of age.
2. DAWN AND DUSK – Mosquitoes that transmit WNV usually bite in the early morning and evening so it is important to wear proper clothing and repellent if outside during these times. Make sure that your doors and windows have tight-fitting screens to keep out mosquitoes. Repair or replace screens that have tears or holes.
3. DRAIN – Mosquitoes lay their eggs on standing water. Eliminate all sources of standing water on your property by emptying flower pots, old car tires, buckets, and other containers. If you know of a swimming pool that is not being properly maintained, please contact your local mosquito and vector control agency.