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    Infectious Disease Prevention Section
    Mail Code: 1927
    PO BOX 149347 - Austin, TX 78714-9347
    1100 West 49th Street, Suite G401
    Austin, TX 78714

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


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Week 9

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2005-2006 Texas Influenza Surveillance Information

2005-2006 Season Summary

The flu activity level for the week ending March 4, 2006 is widespread. Flu activity was reported in all regions of the state.

Reports were received from all 11 Health Service Regions (HSRs) for week 9. An increase in flu activity was reported only in HSR 8. Activity remained about the same in HSRs 2/3, 6/5S, 7, and 9/10. A decrease in flu activity was reported in HSRs 1, 4/5N, and 11. For a map of Health Service Regions, please visit the following website:

Texas Health Service Regions Map

During week 9, culture confirmed influenza A was identified in Bell, Brazos, Coryell, Dallas, Harris, McLennan and Williamson Counties.

A new strain of influenza A named, A/Wisconsin/67/2005-like (H3N2), has been identified from an isolate submitted to The Centers for Disease Control and Prevention (CDC) by the DSHS laboratory in January 2006. The specimen was collected from a resident of Travis County in December 2005. A/Wisconsin/67/2005 is an antigenic variant, which evolved from A/California/07/2004. An A/Wisconsin/67/2005-like virus was recommended by the World Health Organization (WHO) to be included as the H3 component for the 2006-2007 Northern Hemisphere vaccine formulation.

The majority of isolates submitted to CDC by the DSHS lab for further characterization continue to be identified as A/California/07/2004-like (H3N2), which is the H3 component of the current vaccine. A second strain of influenza A named, A/New York/55/2004-like (H3N2), was identified earlier in the season in a resident of Bell County. It has since been identified in a resident of Dallas County. A/New York/55/2004-like (H3N2) is antigenically equivalent to A/California/07/2004-like (H3N2).

Culture confirmed influenza B was identified in Brazos, Dallas, Harris, McLennan, and Travis Counties during week 9. Results on four of the influenza B isolates submitted to CDC by the DSHS lab have come in and indicate that three of the isolates are B/Florida/07/2004-like and one isolate is B/Ohio/01/2005-like. Influenza B viruses currently circulating can be divided into two antigenically distinct lineages represented by B/Yamagata/16/88 and B/Victoria/2/87 viruses. B/Florida/07/2004 is a minor antigenic variant of B/Shanghai/361/2002 and B/Ohio/1/2005 is antigenically equivalent to B/Malaysia/2506/2004.

Overall, the number of flu specimens submitted to the DSHS lab continues to decrease.

Only one influenza outbreak was reported during week 9 in a high school in Erath County (HSR 3).

For more information on flu surveillance activities in the State of Texas, please visit the following website:

http://www.dshs.state.tx.us/IDCU/disease/influenza/surveillance/Surveillance.aspx

Data from the Sentinel Provider Surveillance Network (SPSN) indicates a decrease in influenza-like illness (ILI).

PERCENTAGE OF VISITS FOR INFLUENZA-LIKE-ILLNESS REPORTED BY SENTINEL PROVIDERS IN TEXAS
Week # Reporting Age 0-4 Age 5-24 Age 25-64 Age over 64 Total ILI Total Patients % ILI
2005-49 39 118 181 116 3 418 12894 3.24
2005-50 45 160 268 190 13 631 14410 4.37
2005-51 44 146 149 61 7 363 7797 4.65
2005-52 39 219 232 363 29 843 10140 8.31
2006-01 40 177 201 297 46 721 11399 6.32
2006-02 55 229 359 269 36 893 15487 5.76
2006-03 47 297 399 287 28 1011 13520 7.47
2006-04 69 331 469 304 42 1146 18518 6.18
2006-05 64 282 420 265 44 1011 17853 5.66
2006-06 67 278 375 230 27 910 18375 4.95
2006-07 62 239 358 207 33 837 18270 4.58
2006-08 62 242 371 233 37 883 16668 5.29
2006-09 49 182 257 165 21 625 13136 4.75


Percentage of Physician Visits Due to Influenza-Like Illness Texas Sentinel Providers Surveillance Network 2005-2006 Season

Percentage of Physician Visits Due to Influenza-Like Illness, Texas Sentinel Providers Surveillance Network 2005-2006 Season

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Statewide Influenza Activity For the Week Ending March 4, 2006 (MMWR Week 9)

Statewide Influenza Activity

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

2005-2006 Texas Influenza Surveillance Information - Flu Reports

For the week ending: 
10/15/05, 10/22/05, 10/29/05, 11/05/05, 11/12/05, 11/19/05, 11/26/05, 12/10/05, 12/17/05, 12/24/05, 01/07/06, 01/14/06, 01/21/06, 01/28/06, 02/04/06, 02/11/06, 02/18/06, 02/25/06, 03/11/06, 03/18/06, 03/26/06, 04/01/06, 04/08/06, 04/15/06, 04/22/06, 04/29/06, 05/12/06, 05/19/06, 05/20/06

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Last updated May 10, 2021