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Mosquito-borne encephalitis in the U. S. is prevalent in several forms and is geographically wide-spread. The Western Equine and St. Louis viral strains were the most common before the invasion of West Nile Virus.   West Nile Virus first showed up in Idaho in 2004 and in 2006 Idaho led the nation in reports of human illness associated with WNV with 996 cases being reported to the state health department. Encephalitis is an inflammation of the brain and central nervous system, and is characterized by a high to moderate mortality rate, with some survivors left with permanent physical and mental disabilities. Contact the Health department or you doctor for more information.

For More information visit http://www.cdc.gov/ncidod/diseases/list_mosquitoborne.htm

TFCPAD traps mosquitoes to test for virus through the county during the summer. Trapped mosquitoes are separated by species using a microscope. Some species are more prone to carry diseases than others and we try to focus our work more on them. Trapping of mosquitoes also allows us to monitor the effectiveness of our treatments and find additional areas in need of treatment.
Map of Idaho WNV: http://www.healthandwelfare.idaho.gov/Portals/0/Health/Epi/WNV/2013%20WNV%20case%20counts%203.pdf

2014

June 16, Mosquito count low.  No WNV detected in Twin Falls County.

2013

August 21, All mosquito pools tested negative this week.

August 14, Overall mosquito numbers and positives pools are declining.

Of the 3 locations that tested positive last week. 2 retested positive this week, along with a new location. 
Retesting locations from last week.

Trap # 201-13  ( Set along river near Jerome/ TF County Border)

Trap # 202-13  ( Set about 2 miles away from the Snake River and about 4 miles NW of Buhl)

New location,

Trap # 205-13 ( Set about 4miles away from the Snake River along Rock Creek near Twin Falls)


August 7, The expanded river corridor treatment is paying off, mosquito numbers are decreasing and only 2 of  the 6 locations retested as positive this week.  A new  location tested positive about 2 miles away from the river and about 4 miles NW of Buhl.
Please take the proper precautions as WNV is only as far away as a bird or mosquito can fly and just because it has not been found in your area doesn't mean its not there.

July 31, One of the sites that tested positive last week tested positive again this week.Over all mosquito numbers in this area are declining.

In addition  5 traps along the snake river corridor between Twin Falls and Gooding County tested positive for WNV.
(Positive mosquitoes were found in Gooding County this week as well.) Treatment and surveillance will be expanded in this area.

July 24, WNV found in mosquitoes trapped along the Snake River between Jerome and Twin Falls County.
Two Mosquito pools tested positive.  Surveillance and treatment of that area will be expanded. Take the proper precautions to avoid mosquitoes and eliminate their habitat.

July 17, No WNV in our traps, over 150 sites sampled to date, however WNV is endemic to Idaho and has been found in several places around the state. Recent hot weather has sped up the growth cycle, so watch out for standing water.

June 28, No WNV to date.

May 30, Trap counts low, No WNV detected. With recent rain don't forget to drain containers!

April 22, 2013 Weekly traping and testing of Mosquitoes is underway!

2012

September 13, Trap counts for all species of mosquitoes were low. No Culex Tarsalis (our primary WNV carrier) were found in traps. All tests for WNV were negative.

September 6, Trap counts remain low, all tests for WNV were negative this week.


August 29, All traps this week have had low mosquito counts and tested negative for WNV! The cooler nights are slowing down the rate at which mosquitoes complete there life cycle. We are past the peak of summer mosquitoes numbers.

August 24, 10 traps were set August 20. One was a follow up to last week’s Buhl locations positive WNV finding.  It again contained a positive WNV mosquito. The good news is that total mosquitoes trapped at this location had declined by over 75 percent in the last 5 days. This area will continue to be monitored. In addition, a second positive mosquito pool was found west of Hansen near the South Hills. Once again this is a reminder that WNV is endemic to Idaho finding it is not a surprise. These findings help focus the work of the abatement district. If you live in are where it hasn’t been found yet, you still should take basic precautions to avoid mosquitoes and avoid creating mosquito habitat. 

August 17, During routine mosquito surveillance. A trap set Wednesday August 15 in a rural area West of Buhl contained Culex mosquitoes that tested positive for WNV. This was one of 18 traps set out this week.  All other traps tested negative.. Expanded surveillance and treatment of this area has been conducted. This finding is a reminder for people to take the proper precautions. 

August 8, No WNV found to date, Over 150 locations trapped with more than 5,000 mosquitoes put under the microscope to date. Please rember that  WNV is endemic to Idaho and even though we haven't found it yet residents still should take steps to elimate standing water!
 

July 11, Weekly mosquito trapping and survilance is underway, no WNV has been found to date.

Trapping and testing started in April, No WNV found as of June 6th Please report areas where you find mosquitoes!

2011

10-28 Last trap date, No WNV found during season.

8-18 No WNV found in over 100 trap samples to date. High levels of nuicance mosquitoes found in some parts of the county, still need to treat drain or dump out standing water!

6-24 Weekly mosquito trapping and survilance is underway, no WNV has been found to date.

5-15 Start of mosquito trapping and disease survilance as permited by the weather.

2010

Aug 24, Over 200 trap samples have been tested for WNV, none has been found to date. Trapping and testing will continue.

4-26 First traps set for mosquito survelance, trapping will continue every week during the summer.

2009

Weekly trapping of mosquitoes in Twin Falls County started in May, Mosquitoes identified as the species Culex are tested for West Nile virus. 

8-25  First positive mosquito sample for West Nile Virus in Twin Falls County. Two mosquito traps near Buhl contained mosquitoes that tested positive for West Nile Virus. The TFCPAD is expanding surveillance and treatment in that area and encourages everyone to help eliminate mosquito habitat by draining standing water, and avoiding their bites through the use of repellents. 

9-1 Additional Positive Mosquito sample for West Nile Virus. One trap located 1 mile north of Filer tested positive. The trap only contained two mosquitoes! All additional samples from the area of earlier positives have been negative and subsequent traps set in the same location near filer failed to catch any mosquitoes. TFCPAD is continuing to treat for mosquitoes and encourages everyone to take the proper precautions!


 For more Information on West Nile virus please visit http://www.westnile.idaho.gov/!


Mosquito Identification