West Nile Virus
West Nile virus (WNV) is a disease caused by the bites of infected mosquitoes. The virus survives in nature in several types of birds and is transmitted by the bites of mosquitoes that feed on infected birds. WNV spreads during warm weather months when mosquitoes are most active. While not all mosquitoes carry this virus, the type of mosquito that spreads this virus is found throughout Los Angeles County.
WNV first emerged in Los Angeles County in 2004, and since has caused significant numbers of illnesses, including hospitalizations and deaths. Each year, between 150 and 300 people in Los Angeles County are identified with WNV infection. While everyone is at risk for WNV, people over 50 and those with health problems are at greater risk of serious illness, this can include meningitis (brain infection), encephalitis (swelling of the brain) and limb paralysis.
WNV Levels Elevated in Los Angeles County
Los Angeles County has experienced increased levels of WNV activity for the past 5 years. The Los Angeles County Department of Public health urges all residents to limit the spread WNV by stopping mosquitoes from infesting your home and yard, and to protect yourself and your family from mosquito bites by using repellant when outdoors.
Having problems with mosquitoes? Contact information is available
To receive the free weekly emailed West Nile Virus and Other
Arboviral Diseases Report (published during WNV season) email:
News and Updates 2017