Influenza Information
South Dakota Department of Health Influenza Summaries (2013)
The South Dakota Influenza summary for the week ending 13 April 2013 (week 15) is posted
at: http://doh.sd.gov/Flu/PDF/Week15.pdf
Influenza activity decreased to “SPORADIC”-level in South Dakota during the past week.
For more information on the emerging influenza H7N9 in China please see
www.cdc.gov/flu/avianflu/h7n9-virus.htm
· 8 new confirmed* cases of influenza were reported last week: 25% Influenza A and 75% Influenza B, (983 confirmed cases cumulative so far this season). [*Lab confirmed: PCR, culture or DFA]
· 1 new influenza-associated death reported; 38 total deaths for season, including 3 pediatric deaths. Median age: 88 years (range <1-100 years). 50% female, 50% male; 11% American Indian; 89% White. Residents of the following counties: Beadle 1, Brookings 1, Brown 3, Butte 1, Charles Mix 1, Codington 1, Davison 1, Dewey 1, Edmunds 1, Fall River 3, Grant 3, Hamlin 1, Hand 1, Hughes 3, Hutchinson 1, Lake 2, Meade 2, Minnehaha 5, Pennington 5 and Yankton 1.
· 4 new influenza-associated hospitalizations reported this week (358 hospitalizations so far this season).
· 11% positive rapid antigen tests reported statewide (19 positives out of 180 individuals tested last week).
· 2% of K-12 students were absent due to illness, range 0% - 4% absent (108 schools reporting encompassing 39,439 students).
· The SD ILI-Net reports 0.6% of outpatient visits were for Influenza-Like Illness (ILI), which were 20 patients of 3,088 outpatients during the week. 40% of ILI patients were children ≤4 years of age. (22 South Dakota clinics participate in the CDC’s ILI surveillance program.)
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Influenza seasons, South Dakota 2003 to 2013
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Season
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Dominate virus
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Deaths
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Hospitalizations
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Confirmed cases
(Culture, PR, DFA)
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Peak week
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2003-2004
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A(H3N2)
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25
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Not reportable
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1,027
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December 2nd week
|
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2004-2005
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A(H3N2)
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42
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Not reportable
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684
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February 3rd week
|
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2005-2006
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A(H3N2)
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11
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Not reportable
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636
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March 2nd week
|
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2006-2007
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A(H1N1)
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6
|
132
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400
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February 3rd week
|
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2007-2008
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A(H3N2)
|
22
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361
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684
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February 4th week
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2008-2009
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A(H1N1)
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4
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134
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525
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March 1st week
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2009-2010
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A(H1N1) pandemic
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24
|
431
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2,303
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October 2nd week
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2010-2011
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A(H3N2)
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20
|
290
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860
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February 3rd week
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2011-2012
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A(H3N2)
|
17
|
164
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505
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March 3rd week
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2012-2013
(as of 6 Apr-2013)
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A(H3N2)
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38
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358
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981
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January 2nd week
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Median (2003-2012)
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|
20
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227
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684
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February 3rd week
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Influenza surveillance website
http://doh.sd.gov/Flu/
Thank you to Vickie Horan, Influenza Surveillance Coordinator, for the surveillance report and Danette Hoffman who does most of the flu PCR testing at the SD Public Health Laboratory.
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National Synopsis: influenza activity decreased in the United States. Nationally, 26% influenza A and 74% influenza B out of 8,802 specimens tested.
Influenza activity estimates for last week:
- WIDESPREAD (highest activity level) influenza activity in 3 states;
- REGIONAL activity in 6 states;
- LOCAL activity in 8 states;
- SPORADIC activity in 33states, including South Dakota;
- NO ACTIVITY in 0 states;
Neighboring states:
- SPORADIC activity in North Dakota, Minnesota, Iowa, Nebraska, Wyoming, Montana and South Dakota.
National influenza activity is reported weekly by CDC on Fridays (please see www.cdc.gov/flu/weekly ).