West Nile Virus

West Nile Virus Cycle - click on image to enlarge

Although the weather is cooling down, the threat of West Nile Virus is still with us. The blog today and tomorrow will largely be taken from a letter sent out by San Diego County's Vector Control Program, part of the Department of Environmental Health. Perhaps you've received a similar letter warning that West Nile Virus (WNV) has been detected in your neighborhood. Here are some notes from the letter, copied in an effort to better educate our readers and customers - and keep you safer.

West Nile Virus is transmitted to humans through the bite of infected mosquitoes. The symptoms of WNV include: headache, fever, nausea, fatigue, skin rash or swollen glands. About one in 150 people infected with WNV develop more severe symptoms, such as meningitis, encephalitis, or myelitis. If you think you have symptoms of WNV, contact your healthcare provider.

The best protection against WNV is to prevent mosquito bites and mosquito breeding. To prevent mosquito bites it is very important to use mosquito repellent, avoid going outdoors at dawn and dusk, wear long sleeves and pants when outdoors, and keep door and window screens closed and in good repair.

You can also protect the health of your family, friends and neighbors by controlling mosquitoes and eliminating the places where they breed. Mosquitoes can lay their eggs in as little as a quarter inch of standing water. Look for and remove standing water from your property.

Vector Control Technicians are constantly surveying and treating mosquito breeding sites in San Diego. See our previous blogs here for more information on the Vector Control Program, one of the finest in the country. If you know of any sources of standing water or mosquito breeding sites, including neglected "green" swimming pools, please call them at 858-694-2888. They will send a technician to investigate and treat the site. For more information on mosquitoes or WNV, visit the Vector Control website at www.SDFightTheBite.com or call 888-551-4636.

Tomorrow's blog will give Vector Control's checklist of things you can do to maintain your property and increase personal safety against West Nile Virus.

Mosquitos in the News

Mosquitos are making front-page news today in San Diego. The San Diego Union-Tribune features a large article on the increase in "green pools" in the area and how they are breeding havens for mosquitos. Apparently, one side effect of the slump in the housing market and the increasing number of foreclosures is the neglect of neighborhood swimming pools. Without proper care, these pools become green breeding ponds, attracting mosquitos that lay eggs on the surface. Literally working overtime, vector control agents here are doing all they can to keep us safe. Here are some interesting facts from the article.

County environmental health officers have spotted nearly 900 "green" pools since May, using sheriff's helicopters to survey the city from the air. Mosquitos that hatch from these pools are rarely infected with the West Nile virus, but the incidence of birds that have died from the virus in the area has increased. Mosquitos that feed on infected birds and then on humans pass along the virus. What this means is that lowering the number of mosquitos in the San Diego area will lower the risk of human infection. For this reason, the county advises pool owners to maintain a proper chemical balance in their pools. Free mosquito-eating fish are available for ponds or green pools at the vector control office at 9325 Hazard Way, or by calling 858-695-2888. They advise us to use insect repellant containing the active ingredient DEET, wear protective clothing, repair window and door screens, and dump containers of stagnant water. For more information, go to sdfighhtthebite.com or westnile.ca.gov.

West Nile Warning

San Diegans love the outdoors. Our temperate weather, beautiful landscapes, and proximity to nature's best venues draw us out - especially at this time of year. But last week the Union-Tribune reported two more cases of West Nile Virus here in San Diego County, and a recent online article posted by the County warns about the arrival of this summer's most unwanted tourists, the mosquitoes that carry this disease. These warnings shouldn't drive us all indoors, but may give us the tools we need to protect ourselves and our families.

West Nile Virus is spread to humans through the bites of infected mosquitoes. Although it is potentially dangerous, only one in 150 people who are infected develop severe illness. Most at risk are the elderly and people with impaired immune systems. Eighty percent of people infected will show no symptoms at all. Symptoms can include fever, head and body aches, nausea, and swollen lymph glands. More serious indications include convulsions, disorientation, vision loss, and even coma. A local West Nile victim shared her experience here  in hopes of educating the public about the disease and its effects.

The County's West Nile Virus website gives information on the Vector Control Program's monthly larviside applications at area parks and open spaces where mosquitos are known to breed, as well as listing ways we can protect ourselves against the disease. The first thing homeowners can do, as touched on here in a previous post, is to inspect yard areas for mosquito breeding sources. Drain standing water in unused pools, buckets, flowerpots, bird baths, etc. You  might be surprised at the sources in your own backyard. Make sure windows and doors are properly screened, and that the screens are in good repair. If you have an ornamental pond, consider stocking it with Gambusia, or Mosquito Fish. The County advises we limit outdoor activities at dawn and dusk, when mosquitoes are most active, use insect repellant, and avoid sleeping outdoors unprotected when camping. Vector Control also encourages county residents to report dead birds. For more information on the Vector Control program, call (858)694-2888 or visit the California West Nile Virus Website.