California reports 1st death of West Nile virus in 2018

The California Department of Public Health (CDPH) announced Monday two confirmed deaths in California due to West Nile virus (WNV). The deceased were residents of Glenn County and Yuba County.

As of September 7, the CRPD has reported 56 human cases of WNV in 21 counties of California this year. In addition, 422 dead birds from 18 counties were tested positive for WNV in 2018, and 1,606 mosquito samples from 28 counties were also tested positive for WNV this year.

"We are still in the midst of transmission of West Nile virus into the state, so we urge everyone to take all possible precautions to protect themselves from mosquito bites," said Karen Smith, director of the CDPH and responsible of public health.

West Nile virus is influenced by many factors, including the climate, number and types of birds and mosquitoes in a region, and the level of WNV immunity in birds. West Nile virus is transmitted to humans and animals by the bite of an infected mosquito. The risk of serious illness for most people is low. However, some people – less than 1% – can develop serious neurological diseases such as encephalitis or meningitis.

People 60 years of age and older and people with diabetes or hypertension are more likely to become ill and are more likely to develop complications.

The CRPD recommends that individuals protect themselves from mosquito bites and WNV by practicing the "Three Ds":

1. DEET – Apply an insect repellent containing DEET, picaridin, lemon eucalyptus oil or IR3535 according to the label instructions. Repellents prevent mosquitoes from biting you. Insect repellents should not be used in children under two months of age.
2. DAWN AND DUSK – Mosquitoes that transmit West Nile virus usually bite early in the morning and in the evening. It is therefore important to wear appropriate clothing and insect repellent if you are outside during these hours. Make sure your doors and windows have tightly fitting mosquito nets. Repair or replace screens that have tears or holes.
3. DRAIN – Mosquitoes lay their eggs on stagnant water. Eliminate all sources of stagnant water on your property by emptying flowerpots, old car tires, buckets and other containers. If you know of a pool that is not well maintained, please contact your local mosquito and mosquito control agency.