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West Nile virus at highest level ever in mosquitoes

by The AV Times Staff • September 4, 2014

Unused pools are potential breeding ground for West Nile Virus, officials say. Report stagnant pools and other backyard sources to the Antelope Valley Mosquito & Vector Control District by calling 661-942-2917. (File)
Unused pools are potential breeding grounds for West Nile virus, officials say. Report stagnant pools and other backyard sources to the Antelope Valley Mosquito & Vector Control District by calling 661-942-2917. (File)

SACRAMENTO – The state’s public health director is reminding Californians to remain vigilant against the threat of West Nile virus.

“The proportion of mosquitoes infected with West Nile virus is at the highest level ever detected in California,” said Dr. Ron Chapman, director of the California Department of Public Health (CDPH) and state health officer. “Last week, 52 new human cases were reported to CDPH. We expect to see more people become infected as this is the time of year when the risk of infection is the highest.”

West Nile virus is a potentially debilitating disease that’s transmitted by the bite of an infected mosquito.
West Nile virus is a potentially debilitating disease that’s transmitted by the bite of an infected mosquito.

So far in 2014, West Nile virus has been detected in 36 California counties. There have been 181 human cases reported to CDPH, a significant increase compared to the 101 cases reported by this time last year. Eight confirmed deaths have been reported to CDPH.

In the Antelope Valley, the West Nile virus positive tally stands at four mosquito samples, six dead birds and 22 sentinel chickens for 2014. View a map of the WNV-positive locations here.

West Nile virus is transmitted to humans and animals by the bite of an infected mosquito. For most people, the risk of serious illness is low. However, some individuals – less than one percent – can develop a serious neurologic illness, such as encephalitis or meningitis. People 50 years of age or older and people with diabetes and/or high blood pressure have the greatest risk of developing serious complications.

The first human death attributed to West Nile virus infection in the Antelope Valley was reported last fall. The victim was a West Lancaster man in his 70s who was hospitalized with encephalitis in late September 2013 and died shortly thereafter. (Read more here.)

CDPH recommends that individuals prevent exposure to mosquito bites and West Nile virus 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. DEET can be used safely on infants and children 2 months of age and older.
  2. DAWN AND DUSK – Mosquitoes bite in the early morning and evening so it is important to wear protective 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 with tears or holes.
  3. DRAIN – Mosquitoes lay their eggs on standing water. Eliminate all sources of standing water on your property, including flower pots, old car tires, and buckets.

If you know of a swimming pool that is not being properly maintained, contact the Antelope Valley Mosquito & Vector Control District at 661-942-2917. For further questions or services, visit www.avmosquito.org.

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Previous related stories:

Increased West Nile virus activity ahead of Labor Day weekend

Lancaster mosquito samples test positive for West Nile virus

More West Nile virus in the AV

First signs of West Nile virus in the AV for 2014

Filed Under: Health, Lancaster, Palmdale

1 comment for "West Nile virus at highest level ever in mosquitoes"

  1. dumbandblind says

    September 5, 2014 at 10:22 pm

    Presence of West Nile Virus should be directly proportional to the drought.

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