South Dakota Influenza summary for the week ending December 23, 2017
December 29, 2017
· 121 new confirmed* cases of influenza were reported last week. 421 confirmed cases cumulative so far this season: 384 Influenza A and 37 Influenza B. *Lab confirmed: PCR, culture or DFA. The number of laboratories using rapid confirmatory tests has increased, which may account for some of the increase in confirmed cases observed this influenza season.
· 17.4% positive rapid antigen tests reported statewide (122 positives out of 702 individuals tested last week). Total 6,294 tests performed so far this season.
· 19 new influenza-associated hospitalizations reported last week (Brookings, Codington, Day, Grant, Hamlin, Jackson, Lawrence, Lincoln, Mellette, Minnehaha, Oglala Lakota, Pennington, Tripp, Walworth, and Yankton counties). Total of 68 hospitalizations so far this season.
· One influenza-associated death reported last week (Davison County). Total of 2 deaths so far this season.
· 2.58% of clinic visits were for influenza–like illness (ILI), 34.1% of ILI visits were children 4 years of age and younger.
· 1.8% of K–12 students were absent due to any illness, range 0% – 8% absent (56 schools reporting).
|
Season |
Dominate virus |
Deaths |
Hospitalizations |
Confirmed cases (Culture, PR, DFA) |
Peak week |
|
2017-2018 |
Pending |
2 |
68 |
421 |
Pending |
|
2016-2017 |
A(H3N2) |
44 |
965 |
2,078 |
February 3rd week |
|
2015-2016 |
A(H1N1) |
9 |
161 |
786 |
March 2nd week |
|
2014-2015 |
A(H3N2) |
63 |
793 |
1,703 |
January 1st week |
|
2013-2014 |
A(H1N1) |
14 |
239 |
659 |
January 1st week |
|
2012-2013 |
A(H3N2) |
38 |
365 |
993 |
January 2nd week |
|
2011-2012 |
A(H3N2) |
17 |
164 |
505 |
March 3rd week |
|
2010-2011 |
A(H3N2) |
20 |
290 |
860 |
February 3rd week |
|
2009-2010 |
A(H1N1) pandemic |
24 |
431 |
2,303 |
October 2nd week |
|
2008-2009 |
A(H1N1) |
4 |
134 |
525 |
March 1st week |
|
2007-2008 |
A(H3N2) |
22 |
361 |
684 |
February 4th week |
|
2006-2007 |
A(H1N1) |
6 |
132 |
400 |
February 3rd week |
|
2005-2006 |
A(H3N2) |
11 |
Not reportable |
636 |
March 2nd week |
|
2004-2005 |
A(H3N2) |
42 |
Not reportable |
684 |
February 3rd week |
|
Median (2004-2017) |
|
20 |
290 |
860 |
February 3rd week |
Influenza surveillance website: http://flu.sd.gov.
National Synopsis: Influenza activity sharply increased in the past week in the United States. Nationally, 89% influenza A and 11% influenza B of 831 positive specimens tested in public health laboratories.
Influenza activity by state:
– WIDESPREAD (highest level) influenza activity in 36 states; including South Dakota;
– REGIONAL activity in 13 states;
– LOCAL activity in 1 states
– SPORADIC activity in 0 states;
– NO activity in 0 states.
Our neighboring states:
– WIDESPREAD activity: North Dakota, Minnesota, Nebraska, Wyoming Montana and
South Dakota.
– REGIONAL activity: Iowa
