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Home » Santa Clarita News » Season’s First Symptomatic West Nile Case Found In Antelope Valley

Season’s First Symptomatic West Nile Case Found In Antelope Valley

khts_healthCounty officials confirm presence of disease.


The wait is over, as the first symptomatic human case of West Nile Virus (WNV) has been found in Los Angeles County for the 2009 season. According to the County health officer, the case involves a teenager with pre-existing medical conditions from the Antelope Valley who became symptomatic in mid-July. The individual has now recovered.

Earlier this year, two individual blood donors, including one reported in June, tested positive for WNV, but did not show any symptoms (asymptomatic). The donated blood was not used.

With the confirmation that WNV is in the Los Angeles County area, Director of Public Health and Health Officer Jonathan E. Fielding, MD, MPH, is encouraging residents to be careful.

“People should take precautions to avoid mosquitoes, as that is the primary way this disease is transmitted. Mosquitoes obtain the virus by feeding on infected wild birds,” he said. “West Nile Virus can appear anywhere in Los Angeles County or around the state, and we urge residents to get rid of pools of stagnant water around their homes where mosquitoes breed, and to use a repellant containing DEET or another approved repellent when outdoors in mosquito-prone areas, especially around dawn or dusk.”

As of August 5th, Public Health and the independent mosquito abatement districts have detected WNV in 38 dead birds, 6 mosquito pools, and 10 sentinel chickens. The Antelope Valley region of the county has shown the most WNV activity to date in 2009.


In past seasons, most infected birds and positive mosquitoes have been found in the San Fernando Valley, San Gabriel Valley, and East Los Angeles County areas.

Exposure to West Nile Virus
WNV is spread from humans through the bite of an infected mosquito; mosquitoes can become infected by biting a bird that carries the virus. Most mosquitoes do not carry the virus and most people bitten by a mosquito have not been exposed to the virus. The virus is not spread through person-to-person contact, or directly from birds to humans.

In most cases, people who are infected with West Nile Virus never become sick, or have only very mild symptoms that include fever, headache, nausea, body aches, and a mild skin rash. Symptoms of West Nile Virus could appear within three to 12 days after infection.


Fortunately, fewer than one in 150 people who are bitten by an infected mosquito become severely ill, according to the Centers for Disease Control and Prevention (CDC). In these rare cases, the virus can cause encephalitis and death. The elderly are most at risk for severe cases of the disease.

There is no specific treatment for West Nile Virus. However, individuals with severe symptoms may be hospitalized.

Preventive Measures
People can decrease their risk of infection by following these

●    Avoid mosquito-infested areas at dawn and dusk.
●    Wear long-sleeved shirts and long pants whenever you are outdoors.
●    Repellants containing DEET, picaridin, or oil of eucalyptus, when used as labeled, are effective defenses against mosquitoes.
●    Check your window screens for holes.
●    Do not allow water to collect and stagnate in old tires, flowerpots, swimming pools, birdbaths, pet bowls, or other containers. These are prime breeding grounds for mosquitoes.
●    Clean and chlorinate swimming pools; drain water from pool covers.
●    Stock garden ponds with goldfish or other mosquito-eating fish. These eat mosquito eggs and larvae.
●    Empty and wash birdbaths and wading pools weekly.

The Los Angeles County Public Health Department has established a toll-free information line that will provide callers with updated information on West Nile Virus within the county; 800-975-4448.

If a recently dead bird (less than 24 hours) is found, the public is encouraged to report this by calling 877-747-2243.

If residents see a “green pool” or stagnant swimming pool at a home, please report this to Public Health’s Environmental Health Bureau at 626-430-5200.

Where to call with questions about mosquitoes:

  • Greater Los Angeles County Vector Control District: (562) 944-9656
  • Los Angeles County West Vector Control District: (310) 915-7370
  • San Gabriel Valley Mosquito and Vector Control District: (626)814-9466
  • Antelope Valley Mosquito and Vector Control District: (661) 942-2917
  • Compton Creek Mosquito Abatement District: (310) 639-7375
  • Pasadena City Health Department: (626) 744-6004
  • City of Long Beach Vector Control Program: (562) 570-4132

To learn more about Public Health and the work they do, please visit

Season’s First Symptomatic West Nile Case Found In Antelope Valley

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