IDCU HomeInfectious Diseases A-CD-GH-LM-QR-ST-ZIDCU Health TopicsDisease ReportingRelated Rules & RegulationsImmunization BranchAbout IDCURelated DSHS SitesStaff Contact List
  • Loading...
    Contact Us

    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

Surveillance

Loading...

EAID Home

En Español
image1 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

2009 - 2010 Texas Influenza Surveillance Information

The "new" flu season (2009-2010) officially began October 4, 2009. For reports from the
2008-2009 season, please see www.idcu.org/disease/influenza/surveillance/2009/.

Influenza Surveillance Report for MMWR Week 41

The influenza (flu) activity level for Texas for the week ending October 17, 2009 was “widespread.” For definitions of flu activity levels please see http://www.cdc.gov/flu/weekly/fluactivity.htm. During week 41, 734 (26.6%) 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 above the regional baseline during week 41.

Reports from Health Service Regions

Reports were received from all Health Service Regions (HSRs) for week 41. HSRs 1, 6/5S, and 9/10 reported an increased level of flu activity compared to week 40. HSR 8 reported the same level of flu activity compared to week 40. HSRs 2/3, 4/5N, 7, and 11 reported a decreased level of flu activity compared to week 40. For a map of Health Service Regions please visit the following website: www.dshs.state.tx.us/regions/state.shtm

Laboratory Results

During week 41, twelve hospital laboratories and public health agencies across Texas reported conducting a total of 2,758 influenza tests (antigen, culture, and PCR) to the National Respiratory and Enteric Virus Surveillance System (NREVSSwindow_ext) sponsored by the Centers for Disease Control and Prevention (CDC). The majority (62%) of influenza tests reported to NREVSS were antigen detection tests; these tests cannot identify the subtype of influenza detected. The results from Texas participants in NREVSS are summarized in the table below.
Testing Information Week 41
No. of specimens tested 2,758
No. of positive specimens (%) 734 (26.6%)
Positive specimens by type/subtype
Influenza A 729 (99.3%)
          Subtyping performed 243 (33.3%)
                A (novel H1N1) 243 (100%)
                A (H3) 0 (0%)
                A (Seasonal H1) 0 (0%)
          Subtyping not performed 486 (66.7%)
Influenza B 5 (0.7%)

Additional influenza test results (rapid tests, culture, PCR) were reported from providers and public health departments throughout the state (see county map below).

Novel Influenza A Virus Infections

Please see the Texas Department of State Health Services (DSHS) novel influenza website (http://www.texasflu.org) and the CDC website (http://www.cdc.gov/h1n1flu/) for more information. Data collection for confirmed novel influenza A (H1N1) hospitalizations, intensive care unit (ICU) admissions, and deaths began in Texas on September 20, 2009. Forty-seven confirmed novel influenza A (H1N1) deaths were reported in Texas residents and one child from Mexico who died in HSR 6/5S prior to September 20, 2009 (these deaths are included in the cumulative data table below). The table below summarizes the current data by Health Service Region. For more data, please see www.dshs.state.tx.us/txflu/splash/news_media.html.

Cumulative Surveillance Case Summary for Novel Influenza A (H1N1)
by Health Service Region and County as of 10/17/2009
Health Service Region Hospitalizations* Intensive Care Unit (ICU) Admissions* Deaths**
Region 1 Total 11 6 2
Region 2/3 Total 198 20 14
Region 4/5N Total 32 8 5
Region 6/5S Total 129 41 16
Region 7 Total 54 13 10
Region 8 Total 93 13 13
Region 9/10 Total 62 6 8
Region 11 Total 147 43 27
Texas Total 726 150 95
*Reporting for hospitalizations and ICU admissions began on 9/20/2009. ICU admissions are included in the hospitalization totals.
**Reporting for deaths began 4/15/2009 and includes a child from Mexico.

Antigenic Characterization

Since June 9, 2009, CDC has reported antigenic characterization results from 8 novel influenza A (H1N1) viruses received from the Texas Department of State Health Services (DSHS) Laboratory since April 26, 2009.

Novel Influenza A (H1N1) [8]

  • All 8 viruses were characterized as A/California/07/2009-like (H1N1), the reference virus selected by the World Health Organization (WHO) as the vaccine strain for the novel influenza A (H1N1) vaccine.
Influenza A (H3N2) [0]
  • No influenza A (H3N2) viruses from Texas have been characterized since April 15, 2009.
Influenza A (H1N1) seasonal [0]
  • No seasonal influenza A (H1N1) viruses from Texas have been characterized since April 15, 2009.
Influenza B (B/Victoria/02/87 and B/Yamagata/16/88 lineages) [0]
    Victoria lineage [0]
  • No influenza B viruses from Texas have been characterized since April 15, 2009.
    Yamagata lineage [0]
  • No influenza B viruses from Texas have been characterized since April 15, 2009.

The national antigenic characterization and antiviral resistance testing results may be found in the CDC weekly flu report at www.cdc.gov/flu/weekly/. The DSHS Laboratory sends a representative sample of influenza viruses to the CDC throughout the flu season.

Antiviral Resistance

Since June 9, 2009, CDC has reported antiviral resistance testing results on 110 novel influenza A (H1N1) isolates received from multiple Texas laboratories since April 26, 2009.
Flu
Types/Subtypes
Isolates Tested (n) Resistant Viruses,
Number (%)
Isolates Tested (n) Resistant Viruses,
Number (%)
Oseltamivir Zanamivir Adamantanes
Influenza A (H1N1) (novel) 110 2 (2%) 0 (0) 42 42 (100%)
Influenza A (H3N2) 0 0 (0) 0 (0) 0 0 (0)
Influenza A (H1N1) (seasonal) 0 0 (0) 0 (0) 0 0 (00)
Influenza B 0 0 (0) 0 (0) N/A* N/A*

                                    *Adamantanes are not effective against influenza B viruses.

CDC has issued interim recommendations for use of antiviral medications in the 2009-10 influenza season. Those recommendations are available at: http://www.cdc.gov/h1n1flu/recommendations.htm.

Influenza–Associated Pediatric Mortality

Seven influenza-associated pediatric deaths in Texas residents (three from previous weeks and four from the current week) are included in this week's report.

The first death occurred during week 39 (week ending October 3, 2009) in a 12-year-old resident of HSR 11 with no significant underlying medical conditions. A specimen from the child was positive for novel influenza A (H1N1). The second death occurred during week 40 (week ending October 10, 2009) in a 9-month-old resident of HSR 4/5N with significant underlying medical conditions. The child's specimen was positive for influenza A (not subtyped) by rapid influenza test. The third death occurred during week 40 in a 5-year-old resident of HSR 7 with no significant underlying conditions. A specimen from the child was positive for novel influenza A (H1N1).

Four deaths were reported during week 41 (week ending October 17, 2009). The first death occurred in a 14-year-old resident of HSR 2/3 with an underlying medical condition. A specimen from the child tested positive for novel influenza A (H1N1). The second death occurred in a 4-month-old resident of HSR 6/5S with no underlying medical conditions. The child was positive for influenza A (not subtyped) by rapid flu test. The third death occurred in a 16-year-old resident of HSR 6/5 with a significant underlying medical condition. The child's specimen tested positive for novel influenza A (H1N1). The fourth death occurred in a 16-day-old resident of HSR 2/3 with no significant underlying medical conditions; however, the child had a co-infection with Group B Streptococcus. A specimen collected from the child tested positive for novel influenza A (H1N1) by PCR. Texas has reported seven influenza-associated pediatric fatalities during the 2009-10 influenza season. There were 16 influenza-associated pediatric deaths reported from April 26, 2009 to October 3, 2009.

School Closures and Institutional Outbreaks

School closures were reported in HSR 1 during week 41. Schools in Hutchinson (1 school), Lipscomb (2), and Oldham (1) counties closed due to ILI and high absenteeism. DSHS has issued guidance for cases of ILI and novel influenza A (H1N1) in summer camps, schools, and congregate facilities. Please see www.texasflu.org for more information. For information on school closures, please see the Texas Education Agency's website at http://www.tea.state.tx.us/index4.aspx?id=5402.

U.S. Outpatient Influenza-like Illness Surveillance Network

Seventy-six 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 41. Of these 75 providers who saw patients, 68 (91%) saw at least one patient with ILI. Of all patient visits during this week, 11.74% were due to ILI. The ILI baseline for HHS Region 6 (Arkansas, Louisiana, New Mexico, Oklahoma, and Texas) of the United States is 4.6% for the 2009-2010 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
10/22/2009 2:38:58 PM
Week # Reporting Age 0-4 Age 5-24 Age 25-49 Age 50-64 Age over 64 Total ILI Total Patients % ILI
2009-31 59 56 92 95 9 252 17727 1.42%
2009-32 57 56 109 81 9 255 17856 1.43%
2009-33 54 46 111 124 13 294 19431 1.51%
2009-34 53 74 267 99 4 444 19483 2.28%
2009-35 52 128 426 99 7 660 20426 3.23%
2009-36 52 132 614 177 10 933 20400 4.57%
2009-37 51 249 1103 307 16 1675 25033 6.69%
2009-38 50 190 663 106 13 972 14168 6.86%
2009-39 47 298 1405 494 14 2211 23619 9.36%
2009-40 91 1113 2188 492 167 56 4016 31377 12.80%
2009-41 76 852 1721 380 125 42 3120 26576 11.74%


ILI Percentage in Texas Chart
ILI Data in Texas Chart

National Influenza Activity Map

The current U.S. flu weekly report (FluView) may be found at http://www.cdc.gov/flu/weekly/fluactivity.htm.
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.



Influenza in Texas Map

1Influenza activity level corresponds to current MMWR week only and does not reflect previous weeks' activity.
2The majority of influenza cases are not reportable by law to the Texas Department of State Health Services. This map contains data from sentinel sites and does not represent all influenza cases in the state.
3Positive laboratory results are reported according to specimen collection date or date received in the lab if the former is unknown.



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 -

Topics A-Z / Site Map

  • Loading...
Last updated January 10, 2011