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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 02

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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

2008 - 2009 Texas Influenza Surveillance Information

Influenza Surveillance Report for MMWR Week 2

The influenza (flu) activity level for Texas for the week ending January 17, 2009 was “regional.” Regional activity indicates that two or more but less than half of the regions in the state are experiencing an increase in influenza-like illness (ILI) and have recent culture-confirmed influenza. During week 2, 235 (22.4%) specimens tested by NREVSS laboratories in Texas were positive for influenza. The percentage of visits for influenza-like illness as reported by ILINet providers in Texas was below the regional baseline.

 

Reports from Health Service Regions

Reports were received from all Health Service Regions (HSRs) for week 2. HSRs 6/5S, 8, and 11 reported the same level of flu activity compared to week 1. All other HSRs reported an increase in flu activity compared to week 1. 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 2, nine hospital laboratories and public health agencies across Texas reported conducting a total of 1,049 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 952 antigen detection tests that were performed, 166 were positive for influenza A/not subtyped and 41 were positive for influenza B. The positive results were reported from Bell, Bexar, Collin, Harris, Lubbock, Nueces, and Tarrant counties. Eight PCR tests positive for influenza A/not subtyped and three PCR tests positive for influenza B were reported from Bell and Tarrant counties. A total of 86 reports of culture-confirmed influenza were received for the following counties:

 

 

Influenza A/H1 Influenza A/H3 Influenza A/not subtyped Influenza B
Brooks County (none) Bell County (2) Bexar County (9)
Kleberg County (2)   Bexar County (26) Brazos County (2)
Medina County   Brazos County Dallas County (2)
    Coryell County Harris County (3)
    Dallas County (15) Kendall County
    Ellis County McLennan County (2)
    Harris County (6) Tarrant County
    Kendall County  
    Madison County (2)  
    McLennan County (2)  
    Williamson County (5)  

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 25 influenza isolates [14 influenza A/H1, 0 influenza A/H3, and 11 influenza B viruses] received from the DSHS Laboratory since the beginning of the 2008–09 flu season.

 

Influenza A/H1 [14]

  • Fourteen (100%) of the fourteen viruses were characterized as A/Brisbane/59/2007, the influenza A/H1 component of the 2008–09 influenza vaccine for the Northern Hemisphere.
Influenza A/H3 [0]
  • No influenza A/H3 viruses from Texas have been characterized yet this season.
Influenza B (B/Victoria/02/87 and B/Yamagata/16/88 lineages) [11]
    Victoria lineage [10]
  • Two (20%) of the ten viruses were characterized as B/Ohio/01/2005-like viruses.
  • Eight (80%) of the ten viruses showed somewhat reduced titers with antisera produced against B/Malaysia/2506/2004 and B/Ohio/01/2005.
    Yamagata lineage [1]
  • One virus was characterized as B/Florida/4/2006, the influenza B component for the 2008-09 influenza vaccine.

 

The national antigenic characterization 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 occurred during week 2.

 

 

School Closures and Institutional Outbreaks

No school closures or institutional outbreaks were reported in week 2.

 

 

U.S. Outpatient Influenza-like Illness Surveillance Network

Fifty-seven sentinel providers in Texas reported data to the U.S. Outpatient Influenza-like Illness Surveillance Network (ILINet) (formerly known as the U.S. Influenza Sentinel Provider Surveillance System) on patients with influenza–like illness (ILI) and total patients seen for any reason during week 2. Thirty-five (61%) of these providers saw at least one patient with ILI. Of all patient visits during this week, 3.57% were due to ILI. The ILI baseline for the West South Central Region (Arkansas, Louisiana, Oklahoma, and Texas) of the United States is 4.8% for the 2008-2009 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 Visits for Influenza–Like Illness Reported by the US Outpatient Influenza–Like Illness Surveillance Network (ILINet) in Texas as of 1/23/2009 4:12:34 PM
Week # Reporting Age 0-4 Age 5-24 Age 25-64 Age over 64 Total ILI Total Patients % ILI
2008-40 77 84 133 127 22 366 20231 1.81
2008-41 77 114 163 124 19 420 20000 2.10
2008-42 78 107 156 90 7 360 19658 1.83
2008-43 78 120 152 106 20 398 19654 2.03
2008-44 79 136 199 103 26 464 20653 2.25
2008-45 77 110 111 122 27 370 20737 1.78
2008-46 72 110 106 103 23 342 19684 1.74
2008-47 74 137 143 122 19 421 19722 2.13
2008-48 78 131 132 125 37 425 16835 2.52
2008-49 74 143 159 153 24 479 19487 2.46
2008-50 72 133 146 107 28 414 18587 2.23
2008-51 66 172 177 173 24 546 16766 3.26
2008-52 73 194 153 154 34 535 13035 4.10
2008-53 74 167 137 165 46 515 14831 3.47
2009-01 73 155 175 185 35 550 17830 3.08
2009-02 57 142 233 194 26 595 16656 3.57


ILI Percentage in Texas Chart

 

ILI Data in Texas Chart

 

 

National Influenza Activity Map

The map showing influenza activity in the United States for MMWR week 2 is displayed below. The current U.S. flu weekly report may be found at: here.

 

 

Influenza in USA Map

*This map indicates geographic spread and does not measure the severity of influenza activity.

 

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