West Nile cases reported The Department of Health has reported 38 new human West Nile (WNV) detections, including 36 new cases and two new blood donor detections. This brings the number of human WNV detections to 141 this season. New detections were reported in, Brown, Brule, Butte, Charles Mix, Clay, Codington, Davison, Hand, Hutchinson, Jerauld, Kingsbury, McPherson, Minnehaha, Moody, Pennington, Roberts, Spink, Turner, Union and Yankton counties. In addition, seven positive Culex tarsalis mosquito pools were detected in Pennington County.�
Forty-eight of South Dakota�s 66 counties, or 73 percent, have now had WNV detections.
�The West Nile transmission is peaking in South Dakota,� said Dr. Lon Kightlinger, state epidemiologist for the department. �In past years human West Nile cases have peaked in August and then declined rapidly in September. People should protect themselves and their families from mosquitoes, especially the elderly and transplant recipients. Communities should intensify their mosquito control measures.��
Provisional data shows that the median age of the South Dakota cases is 42 years, with the range from one to 89 years old. Ninety-four percent of cases are white and six percent are American Indian. Fifty-four percent of cases are male and 46 percent female. Of the cases fully investigated, 15 percent have had WNV neuroinvasive disease, 84 percent have had WNV fever and 1 percent had acute flaccid paralysis.�A case of pregnancy-associated West Nile illness has also been reported. Eighty-four percent of the cases reside in counties east of the Missouri River. At this time last year South Dakota had reported out 26 human detections, and at this time in 2003, 297 human detections had been reported.��
Total South Dakota detections to date include:
? Human disease (128 cases, including 14 suspects and 1 death) ��Brown (24), Davison (16), Charles Mix (8), Butte (6), Spink (4), Beadle (3), Codington (3), Edmunds (3), Grant (3), Hanson (3), Hughes (3), McCook (3), Minnehaha (3), Pennington (3), Stanley (3), Brule (2), Campbell (2), Clay (2), Hand (2), Marshall (2), Moody (2), Roberts (2), Tripp (2), Union (2), Yankton (2) and 1 case each in Aurora, Bennett, Brookings, Buffalo, Day, Deuel, Dewey, Douglas, Hamlin, Hutchinson, Jackson, Jerauld, Kingsbury, Lincoln, McPherson, Mellette, Perkins, Sanborn, Shannon, Turner and Walworth counties.
? Asymptomatic blood donors (12 donors) � Minnehaha (3), Roberts (3) and 1 each in Butte, Clay, Codington, Hand, Hughes and Moody.
? Positive mosquito pools (65) � Beadle (36), Brookings (8), Minnehaha (8), and Pennington (8), Hughes (3), Brown (1) and Lincoln (1) counties.
? Positive birds (12) � Codington, Davison (3), Deuel, Douglas, Gregory, Lyman, Miner, Moody and Roberts (2) counties.
? Positive horses (3) � Clark, Fall River and Spink counties.
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.