2007 - 2008 Texas Influenza Surveillance Information

Influenza Surveillance Report for MMWR Week 5

The influenza (flu) activity level for Texas for the week ending February 2, 2008 is “widespread.” Widespread activity indicates that at least half of the regions in the state are experiencing an increase in influenza–like illness (ILI) and have recent culture–confirmed influenza.

Reports from Health Service Regions

Laboratory Results

Additional positive results from point-of-care rapid flu tests were reported by providers throughout the state (see Texas map below).

Antigenic Characterization

Influenza A/H1 [7]

• Seven (100%) of the seven viruses were characterized as A/Solomon Islands/3/2006, the influenza A/H1 component of the 2007–08 influenza vaccine for the Northern Hemisphere.

• Two (9%) of the 23 viruses were characterized as A/Wisconsin/67/2005–like, the influenza A/H3 component of the 2007–08 influenza vaccine for the Northern Hemisphere.
• Twenty–one (91%) of the 23 viruses were characterized as A/Brisbane/10/2007–like. A/Brisbane/10/2007 is a recent antigenic variant which evolved from A/Wisconsin/67/2005–like.

Victoria lineage [0]
• The influenza B component for the 2007–08 influenza vaccine is a B/Malaysia/2506/2004–like virus, belonging to the B/Victoria lineage.
  Yamagata lineage [3]
• Three (100%) of the three viruses were identified as belonging to the B/Yamagata lineage of viruses.

These results are very similar to national antigenic characterization results. The national results may be found in the CDC weekly flu report at http://www.cdc.gov/flu/weekly/. It is too early in the season to tell how well circulating strains will match the vaccine strains, or which influenza viruses will predominate this season. The DSHS Laboratory sends a representative sample of influenza viruses to the CDC throughout the flu season.

Influenza–Associated Pediatric Mortality

School Closures and Institutional Outbreaks

Sentinel Provider Surveillance Network

 

National Influenza Activity Map

The map showing influenza activity in the United States for MMWR week 5 is displayed below. The current U.S. flu weekly report may be found

For more information on flu surveillance activities in the State of Texas, please visit our main surveillance page.

*Influenza activity level corresponds to current MMWR week only and does not reflect previous weeks' activity.

2007 - 2008 Texas Influenza Surveillance Information --- Flu Reports

For the week ending: 10/6/07; 10/13/07; 10/20/07; 10/27/07; 11/03/07; 11/10/07; 11/17/07; 11/24/07; 12/01/07; 12/08/07; 12/15/07; 12/22/07; 12/29/07; 01/05/08; 01/12/08; 01/19/08; 01/26/08; 02/02/08; 02/09/08; 02/16/08; 02/23/08; 03/01/08; 03/08/08; 03/15/08; 03/22/08; 03/29/08; 04/05/08; 04/12/08; 04/19/08; 04/26/08; 05/03/08; 05/10/08; 05/17/08; Annual Summary;

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