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Press Releases

For Immediate Release  • August 9, 2013
Staff Contact: Rigo Leal, Public Information Officer, 303-651-8840

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Fight the Bite


Longmont Readies For Enhanced Spot Spraying of West Nile Mosquitoes


August 9, 2013 - With a rebound in West Nile Virus positive mosquitoes due to current weather conditions, the City will be implementing enhanced spot spraying in hot spots to reduce the late season threat of West Nile Virus, which includes spraying a larger radius around those hot spots. The City is directing its contractor, Colorado Mosquito Control to conduct enhanced spot spraying using truck mounted spraying at 7 locations in the eastern and southern portions (see map) on Monday, August 12 at 9 p.m. weather permitting. A second application for the same 7 locations is scheduled for Thursday, August 15 at 9 p.m., weather permitting. Those locations are:

1. Jim Hamm District Park (Pace St. east to CR 1, Hwy 66 south to 9th Ave.)

2. Union Reservoir (CR 1 east to CR 5, CR 26 north to CR 28 (City of Longmont Areas))

3. Sandstone Ranch (County Line Rd. east to Sandstone Dr., Hwy 119 south to Quicksilver Rd.)

4. Great Western/Mill Village (Hwy 119 South to Quicksilver Rd, 119th St. east to CR 1)

5. St. Vrain Greenway (Main St. east to 119th St., First Ave. south to Ken Pratt Blvd.)

6. Watersong/Creekside (Extension of Quebec Ave. on the north to Plateau Rd. on the south, 95th St./ Hover St. on the west to a Martin St.)

7. Willow Creek/Clover Basin (Nelson Road south to Pike Road, Grandview Meadows east to Hover Road)

Colorado Mosquito Control will be honoring existing shut-off requests.  

Additionally, the City working with Colorado Mosquito Control (CMC), is evaluating additional larviciding opportunities. Most importantly, residents need to take personal responsibility to protect themselves from mosquitoes.

After receiving monitoring results from mosquito pool trapping in Longmont this week and discussions with officials from Boulder County Public Health (BCPH), and the Colorado Department of Public Health and Environment, the City of Longmont reached a decision to conduct enhanced spot spraying targeting monitoring areas in the City with positive West Nile Virus mosquitoes. To date, there have been 42 of 117 mosquito pools that have tested positive for West Nile Virus (WNV) in Boulder County with 36 in Longmont. There has been 11 confirmed human cases of WNV in Colorado.


WNV activity is widespread throughout Longmont, other parts of Boulder County, and Larimer County. Human infections with WNV can be mild, but some people will develop severe, potentially fatal neurological disease.

In conjunction with this recommendation, BCPH will be implementing emergency spraying within a one-mile buffer of Longmont. In addition, the City of Loveland will be conducting an emergency citywide spraying effort on Sunday and Wednesday nights in response to two more confirmed cases of West Nile Virus in Loveland residents according to Larimer County Health Department.

CMC will apply a pesticide called AquaLuer 20 20, a permethrin based adulticide. The spraying process will produce a very fine mist that will be released from trucks into the air, killing mosquitoes on contact. Most of the spraying will be conducted when adult mosquito activity levels are at their highest, after 9 p.m. Permethrin can and has been used previously for public health mosquito control programs posing little risk to humans and animals, as long as it is applied appropriately. A similar mixture was used to spray the City in July, as well as in prior years. It is estimated that this process was 75% – 80% effective after the two applications in July.

Although permethrin poses minimal threat to humans and animals, some common sense steps can help reduce any unnecessary exposures:

The Vector Index, a calculation that helps indicate the risk of human WNV infection, from August 5 mosquito pool testing in Longmont yielded an index of 3.23. The City-wide spraying successfully reduced the index to 0.2 to 0.32 for the two weeks after spraying.The number has rebounded due to the hot, rainy weather conditions. When an index threshold of 0.75 is reached in a given area, county health officials recommend that leaders in affected municipalities implement emergency spraying.

WNV is a disease that can be transmitted to humans by mosquitoes. While most infections are mild, the more serious infections can cause encephalitis (inflammation of the brain) and/or meningitis (inflammation of the brain's lining), loss of vision, paralysis, coma, tremors, convulsions and in some cases, death.

There is no treatment, cure, or vaccination for WNV; health care providers can only treat the symptoms to help patients feel better and possibly recover more quickly. The only treatment available is prevention.

Public health officials remind residents that, as we enjoy these warm temperatures with outdoor activities, particularly at dusk and dawn, it is important that everyone take action to protect themselves by following ALL of the four Ds. The 4 D’s are:

For more information about WNV, please visit the Boulder County Public Health (BCPH) website at To ask specific questions, call the Colorado Health Education Line for the public at 1-877-462-2911 (available in Spanish and English).

If people suspect they have WNV symptoms, BCPH urges them to consult with their primary care physicians.

For information about West Nile virus, please visit Boulder County web site at or call Boulder County Public Health Hotline at 303-441-1460 or visit