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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


    E-mail

week 13

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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 13

The influenza (flu) activity level for Texas for the week ending March 29, 2008 was “regional.” During week 13, 86 (10.3%) 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 baseline. Flu activity in Texas in week 13 continued to decrease in most regions.

 

Reports from Health Service Regions

Reports were received from all 11 Health Service Regions (HSRs) for week 13. HSR 11 reported the same level of flu activity as week 12. All other regions reported a decrease in flu activity compared to week 12. 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 13, twelve hospital laboratories and public health agencies across Texas reported conducting a total of 831 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 775 antigen detection tests performed, 28 were positive for influenza A/not subtyped and 54 were positive for influenza B. These results were reported from Bell, Bexar, Collin, Dallas, Harris, Lubbock, Nueces, Tarrant, and Webb counties. Positive PCR results for influenza A/not subtyped and influenza B were reported from Tarrant County. A total of 42 reports of culture–confirmed influenza were received from Scott and White Hospital Laboratory, Texas Children’s Hospital Laboratory, NREVSS, and other sources for the following counties:

 

 

Influenza A/H1 Influenza A/H3 Influenza A/not subtyped Influenza B
(None) (None) Bexar County (13) Bell County
    Harris County Bexar County (20)
      Dallas County
      Harris County (5)
      McLennan County

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 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

One influenza–associated pediatric fatality was reported during MMWR week 13, but the death occurred in MMWR week 6 (week ending February 9, 2008). The death occurred in a 3–year–old resident of Health Service Region 6/5S without significant underlying medical conditions. The child tested positive for influenza B by rapid flu test. In addition to influenza, the child had bacterial and viral coinfections. It is unknown whether the child received an influenza vaccination for the current season. As of week 13, 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 13.

 

 

Sentinel Provider Surveillance Network

Seventy–five 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 13. Of the 74 providers who reported seeing patients during week 13, 41 (55.4%) saw at least one patient with ILI. Of all patient visits during this week, 3.69% 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 (4/7/2008 12:35:15 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 84 232 290 162 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 87 369 886 650 54 1959 23306 8.41
2008-05 96 601 1208 954 158 2921 29106 10.04
2008-06 96 557 1128 951 112 2748 28337 9.37
2008-07 99 528 1035 808 124 2495 27815 8.97
2008-08 98 423 787 768 92 2070 26537 7.80
2008-09 90 421 575 687 83 1766 26598 6.64
2008-10 90 343 466 492 79 1380 24925 5.54
2008-11 77 255 363 384 38 1040 17742 5.86
2008-12 74 125 148 90 18 381 12568 3.03
2008-13 75 142 213 273 21 649 17600 3.69


The map showing influenza activity in the United States for MMWR week 13 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