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    Infectious Disease Control Unit
    Mail Code: 1960
    PO BOX 149347 - Austin, TX 78714-9347
    1100 West 49th Street, Suite T801
    Austin, TX 78714

    Phone: 512 776 7676
    Fax: (512) 776-7616


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week 07

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Surveillance

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Influenza Influenza
(Flu)
ICD-9 487; ICD-10 J10,11
Related Topics: Protecting Yourself During the Cold and Flu Season, Avian Flu, Vaccine Preventable Diseases, Asthma and SARS

2007 - 2008 Texas Influenza Surveillance Information

Influenza Surveillance Report for MMWR Week 7

The influenza (flu) activity level for Texas for the week ending February 16, 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

Reports were received from all 11 Health Service Regions (HSRs) for week 7. HSRs 2/3, 4/5N, 6/5S, and 9/10 reported the same level of flu activity as the previous week. HSRs 1, 7, 8, and 11 reported a decrease in flu activity from the previous week. Flu activity in Texas remains widespread overall, but activity appears to be decreasing slightly in some regions. For a map of Health Service Regions, please visit the following website:

 

http://www.dshs.state.tx.us/regions/state.shtm

 

Laboratory Results

During week 7, thirteen hospital laboratories and public health agencies across Texas reported conducting a total of 2,722 influenza tests (antigen, culture, and PCR) to the National Respiratory and Enteric Virus Surveillance System (NREVSSnew window) sponsored by the Centers for Disease Control and Prevention (CDC). Of the 2,481 antigen detection tests performed, 586 were positive for influenza A/not subtyped and 227 were positive for influenza B. These results were reported from Bell, Bexar, Collin, Dallas, Harris, Lubbock, Nueces, Tarrant, Webb, and Wilson counties. Of the 44 PCR tests performed, 7 were positive for influenza A/H3, 6 were positive influenza A/not subtyped, and 3 were positive for influenza B. These results were reported from Bell and Tarrant counties. One additional PCR test positive for influenza A/not subtyped was reported from Taylor County. The Air Force Institute for Operational Health (AFIOH) reported 2 cultures positive for influenza A/not subtyped from Texas Air Force bases in week 7. A total of 157 reports of culture-confirmed influenza were received from NREVSS, the Texas Department of State Health Services (DSHS) Laboratory, Scott and White Hospital Laboratory, Texas Children‘s Hospital Laboratory, AFIOH, and other sources for the following counties:

 

 

Influenza A/H1 Influenza A/H3 Influenza A/not subtyped Influenza B
  Angelina County Bell County (29) Bell County (6)
  Travis County (2) Bexar County (16) Bexar County (25)
    Brazos County (14) Brazos County
    Burleson County Dallas County (5)
    Coryell County Harris County (5)
    Dallas County (10) Madison County
    Harris County (14) McLennan County (4)
    McLennan County (14) Starr County
    Milam County (2) Tarrant County
    Tom Green County  
    Washington County  
    Williamson County (2)  

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

 

Antigenic Characterization

CDC has reported antigenic characterization results from 34 influenza isolates [7 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 [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.
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.

It is not too late to get a flu vaccine for the current season. Although this season‘s flu vaccine strains do not appear to be optimally matched to circulating strains, the flu vaccine may reduce the severity and duration of illness and the risk of serious complications and death due to influenza.

 

Influenza–Associated Pediatric Mortality

No influenza–associated pediatric fatalities occurred during MMWR week 7. As of week 7, Texas has reported five influenza–associated pediatric deaths in the 2007–08 influenza season.

 

 

School Closures and Institutional Outbreaks

One school district closed in Hopkins County due to increased influenza–like illness in week 7. No institutional outbreaks were reported.

 

 

Sentinel Provider Surveillance Network

Seventy–seven sentinel providers 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 7; of those, 70 (91%) providers reported seeing at least one patient with ILI. Of all patient visits during this week, 8.98% 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.

 


Percentage of Influenza–Like Illness (ILI) Reported by Sentinel Providers in Texas as of (2/25/2008 12:29:23 PM)
Week # Reporting Age 0-4 Age 5-24 Age 25-64 Age over 64 Total ILI Total Patients % ILI
2007-40 84 256 163 151 49 619 21410 2.89
2007-41 88 264 255 207 58 784 25255 3.10
2007-42 86 274 270 261 50 855 25776 3.32
2007-43 85 368 290 208 47 913 26428 3.45
2007-44 95 391 276 206 55 928 28213 3.29
2007-45 87 411 314 243 39 1007 25665 3.92
2007-46 79 442 306 215 65 1028 24713 4.16
2007-47 91 478 317 272 73 1140 22748 5.01
2007-48 84 506 298 299 74 1177 26193 4.49
2007-49 84 233 290 162 16 700 20713 3.38
2007-50 80 256 265 128 16 665 18711 3.55
2007-51 68 169 197 186 26 578 15597 3.71
2007-52 77 176 201 191 22 590 12436 4.74
2008-01 90 217 302 332 29 880 16520 5.33
2008-02 97 373 500 630 117 1620 25891 6.26
2008-03 81 289 518 370 36 1213 21940 5.53
2008-04 86 341 864 650 54 1909 23092 8.27
2008-05 95 595 1194 941 156 2886 28923 9.98
2008-06 91 547 1104 934 111 2696 28535 9.45
2008-07 77 450 834 752 116 2152 23960 8.98


The map showing influenza activity in the United States for MMWR week 7 is displayed below. The current U.S. flu weekly report may be found here.

 

 

Influenza in USA Map

 

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




Texas Department of State Health Services - Infectious Disease Control Unit
1100 West 49th Street, Suite T801, Mail Code: 1960 PO BOX 149347 - Austin, TX 78714-9347
(512) 458-7676 - Fax: (512) 458-7616 - E-Mail

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Last updated May 19, 2010