Health

South Dakota Influenza Summary For The Week Ending December 16, 2017

 

South Dakota Department of Health
Pierre, South Dakota

December 22, 2017

South Dakota Influenza summary for the week ending December 16, 2017 (week 50) is posted at:http://doh.sd.gov/diseases/infectious/flu/surveillance.aspx

Influenza activity was at “REGIONAL” level in South Dakota again during the past week.  

·      86 new confirmedcases of influenza were reported last week.   301 confirmed cases cumulative so far this season:  219 Influenza A and 27 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.

·      11.6% positive rapid antigen tests reported statewide (109 positives out of 944 individuals tested last week).    Total 5,576 tests performed so far this season.

·      13 new influenza-associated hospitalizations reported last week (Brown, Codington, Day, Lawrence, Meade, Minnehaha, Pennington,  and Todd counties).  Total of 46 hospitalizations so far this season.

·      One influenza-associated death reported last week (Day County).

·      2.6% of clinic visits were for influenzalike illness (ILI),1.01% of ILI visits were children 4 years of age and younger.

·      2.4% of K12 students were absent due to any illness, range 0% – 8% absent (115 schools reporting).

 

Season

Dominate virus

Deaths

Hospitalizations

Confirmed cases (Culture, PR, DFA)

Peak week

2017-2018

Pending

1

46

301

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, 86.7% influenza A and 13.3% influenza B of 795 positive specimens tested in public health laboratories.

Influenza activity by state:

–    WIDESPREAD (highest level) influenza activity in 23 states;

–    REGIONAL activity in 23 states;  including South Dakota;

–    LOCAL activity in 4 states;

–    SPORADIC activity in 0 states;

–    NO activity in 0 states.

Our neighboring states:

–   WIDESPREAD activity: North Dakota.

–   REGIONAL activity: Minnesota, Iowa, Nebraska, Wyoming, Montana, and South Dakota.

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