Week 16

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2007-2008 Texas Influenza Surveillance Information

Influenza Surveillance Report for MMWR Week 16

The influenza (flu) activity level for Texas for the week ending April 19, 2008 was “sporadic.” Sporadic activity indicates that isolated reports of laboratory–confirmed influenza along with influenza-like illness (ILI) have been reported. During week 16, nine (5.5%) 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 16 continued to decrease in most regions.

Reports from Health Service Regions

Reports were received from all Health Service Regions (HSRs) for week 16. HSRs 1 and 6/5S reported the same level of flu activity as week 15. All other regions reported a decrease in overall flu activity compared to week 15. For a map of Health Service Regions, please visit the following website:

Texas Health Service Regions Map

Laboratory Results

During week 16, seven hospital laboratories and public health agencies across Texas reported conducting a total of 164 influenza tests (antigen, culture, and PCR) to the National Respiratory and Enteric Virus Surveillance System ( NREVSS)sponsored by the Centers for Disease Control and Prevention (CDC). Of the 142 antigen detection tests performed, two were positive for influenza A/not subtyped and seven were positive for influenza B. These results were reported from Nueces and Lubbock counties. Scott and White Hospital Laboratory reported one specimen positive for influenza B by DFA and EIA from Comal County. The Texas Department of State Health Services Laboratory reported one culture positive for influenza A/H3 from El Paso County. Additional positive results from point-of-care rapid flu tests were reported by providers throughout the state (see Texas map).

Antigenic Characterization

CDC has reported antigenic characterization results from 35 influenza isolates [8 influenza A/H1, 24 influenza A/H3, and 3 influenza B viruses] received from the DSHS Laboratory since the beginning of the 2007–08 flu season.

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.

Influenza A/H3 [24]

• Two (8%) of the 24 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 (88%) of the 24 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 24 viruses showed somewhat reduced titers with antisera produced against A/Wisconsin/67/2005 and A/Brisbane/10/2007.

Influenza B (B/Victoria/02/87 and B/Yamagata/16/88 lineages) [3]

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/. The DSHS Laboratory sends a representative sample of influenza viruses to the CDC throughout the flu season.

Influenza–Associated Pediatric Mortality

No influenza–associated pediatric fatalities were reported during week 16. As of week 16, Texas has reported seven influenza–associated pediatric deaths in the 2007–08 influenza season.

School Closures and Institutional Outbreaks

No school closures or institutional outbreaks were reported during week 16.

Sentinel Provider Surveillance Network

Sixty–nine sentinel providers in Texas reported data to the U.S. Influenza Sentinel Provider Surveillance System (SPSN) on patients with influenza–like illness (ILI) and total patients seen for any reason during week 16; of the 67 providers who reported seeing patients, 29 (43.3%) providers saw at least one patient with ILI. Of all patient visits during this week, 3.56% were due to ILI. The ILI baseline for the West South Central Region (Arkansas, Louisiana, Oklahoma, and Texas) of the United States is 4.3% for the 2007–2008 season. The baseline is the mean percentage of patient visits for ILI during non–influenza weeks for the previous three seasons plus two standard deviations.

National Influenza Activity Map
 

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

The map showing influenza activity in the State of Texas for MMWR week 11:

*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:
10/06/07, 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, 04/26/08, 05/03/08, 05/10/08, 05/17/08

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