2007 - 2008 Texas Influenza Surveillance Information

Influenza Surveillance Report for MMWR Week 20

The influenza (flu) activity level for Texas for the week ending May 17, 2008 was “sporadic.” Sporadic activity indicates that isolated reports of laboratory–confirmed influenza along with influenza–like illness (ILI) have been reported. During week 20, four (5.4%) specimens tested by NREVSS laboratories in Texas were positive for influenza. The percentage of visits due to influenza–like illness (ILI) as reported by SPSN providers in Texas was below the regional baseline. Flu activity in Texas in week 20 continued to decrease in all regions. Week 20 is the last week of the influenza reporting season.

Reports from Health Service Regions

Laboratory Results

Antigenic Characterization

Influenza A/H1 [8]

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

• Three (11%) of the 27 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–three (85%) of the 27 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.
• One (4%) of the 27 viruses showed somewhat reduced titers with antisera produced against A/Wisconsin/67/2005 and A/Brisbane/10/2007.

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 [7]
• Six (86%) of the four viruses were identified as belonging to the B/Yamagata lineage of viruses.
• One (14%) of the seven viruses showed a somewhat reduced titer with antiserum produced against B/Florida/04/2006.

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/. 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 20 is displayed below. Please note that the flu activity level for Texas on this map has not been updated to reflect the amended report of “sporadic” activity for week 20. The current U.S. flu weekly report may be found at:

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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