West Nile detected in Clay County The Department of Health has reported four new human West Nile (WNV) detections, including two cases of WNV disease and two asymptomatic blood donors, bringing to 20 the number of human WNV detections this season. The new detections were reported in�Butte, Clay, Dewey and Edmunds counties. In addition, three more positive�Culex�mosquito pools were reported in�Beadle�County�and a positive crow was reported in�Davison�County.
Twenty-three of�South Dakota�s 66 counties, or 35 percent, have now had WNV detections.
Ages for the human detections range from 14 to 62 years old. Fifty-three percent of cases are female and 47 percent male. Of the cases fully investigated, seven percent have had WNV neuroinvasive disease and 93 percent have had WNV fever. Nationally, 18 states have reported a total of 109 human WNV detections to CDC, with�California�having the most at 45.
Total�South Dakota�detections to date include:
? Human disease � Beadle, Brown (2), Brule, Butte, Campbell, Charles Mix, Dewey, Douglas, Edmunds, McCook (2), Pennington, Shannon, Stanley and Tripp counties.
? Asymptomatic blood donors ��Butte, Clay, Hand and Hughes counties.
? Positive mosquito pools � Beadle (5), Brookings (2), Hughes (2), Lincoln and Pennington counties.�
? Positive birds � Davison, Douglas, Lyman, Moody and Roberts counties.
? Positive horse ��Spink�County.
The department recommends the following precautions to prevent mosquito bites and reduce the risk of WNV:
? Use mosquito repellents containing DEET or picaridin.
? Wear shoes, socks, long pants and a long-sleeved shirt to limit mosquito exposure.
? Limit time outdoors at dusk and dawn when mosquitoes are most active.
? Eliminate standing water that gives mosquitoes a place to breed.�
? Support local mosquito control efforts.
Personal precautions are particularly important for the elderly, pregnant women, and transplant patients. People with a severe or unusual headache should see their physician.
For more information about�West Nile�visit the Department of Health Web site at�http://WestNile.sd .gov�or call 1-800-592-1861. Information is also available from the�SDSU Cooperative Extension Service at�http://sdces.sdstate.edu /westnile/�and the South Dakota Animal Industry Board at�www.state.sd.us /aib.�