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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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2010-2011 DSHS Flu Report Week_52

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2010 - 2011 Texas Influenza Surveillance Information

Please note: The 2010-2011 influenza season began on October 3, 2010. For reports from the 2009-2010 season, please see http://www.dshs.state.tx.us/idcu/disease/influenza/surveillance/2010/.

During week 52 in Texas:

  • The influenza (flu) activity level (geographic spread of influenza) for Texas was "regional" and the ILINet Activity Level Indicator was "minimal". For more information please see http://www.cdc.gov/flu/weekly/fluactivity.htm and the national FluView weekly report at http://www.cdc.gov/flu/weekly/.
  • Three hundred and seventy (20.2%) specimens tested by NREVSS laboratories in Texas were positive for influenza. One specimen was positive for 2009 influenza A (H1N1), 41 specimens were positive for influenza A (H3N2), 26 specimens were positive for influenza A (not subtyped), and 14 specimens were positive for influenza B by PCR testing; the remaining positive results were obtained by antigen detection test.
  • The percentage of visits for influenza-like illness as reported by ILINet providers in Texas was below the state and regional baselines.
  • No influenza-associated pediatric deaths were reported.
  • No outbreaks or school closures were reported.

 

 

Reports from Health Service Regions

Reports were received from all Health Service Regions (HSRs) for week 52. HSRs 1, 8, and 9/10 reported an increased level of flu activity compared to week 51. HSRs 2/3, 4/5N, 6/5S, and 7 reported the same level of flu activity compared to week 51. HSR 11 reported a decreased level of flu activity compared to week 51. For a map of Health Service Regions please visit the following website: http://www.dshs.state.tx.us/regions/state.shtm

 

 

Laboratory Results

Influenza

During week 52, nine hospital laboratories and public health agencies across Texas reported conducting a total of 1835 influenza tests (antigen, culture, and PCR) to the National Respiratory and Enteric Virus Surveillance System (NREVSS) sponsored by the Centers for Disease Control and Prevention (CDC). Seventy-three percent of the 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 52
No. of specimens tested 1835
No. of positive specimens (%) 370 (20.2%)
Positive specimens by type/subtype
Influenza A 325 (87.8%)
          Subtyping performed 42 (12.9%)
                 A (2009 H1N1) 1 (2.4%)
                 A (other H1N1) 0 (0%)
                 A (H3N2) 41 (97.6%)
           Subtyping not performed 283 (87.1%)
Influenza B 45 (12.2%)

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

 

Other Respiratory Viruses

The NREVSS system collects information on a variety of respiratory viruses in addition to influenza including parainfluenza, respiratory syncytial virus (RSV), rhinovirus, human metapneumovirus (HMPV), and respiratory adenovirus. The results from week 52 are summarized below.

 

Virus Number of
Laboratories
Testing
Tests
Performed
Positive
Tests
Percentage
of Tests
Positive
Adenovirus (respiratory) 5 485 15 3.09%
HMPV 5 405 9 2.22%
Parainfluenza 5 485 14 2.89%
Rhinovirus 4 397 84 21.16%
RSV 13 1447 320 22.11%

 

Antigenic Characterization

Since July 2010, CDC has reported antigenic characterization results from 3 influenza A (H1N1) viruses, 14 influenza A (H3N2) viruses, and 7 influenza B viruses received from the Texas Department of State Health Services (DSHS) Laboratory.

 

 

  • Influenza A (H1N1) [3]
    Three viruses were related to A/California/07/2009-like (H1N1), the influenza A (H1N1) component of the 2010-2011 influenza vaccine for the Northern Hemisphere.
  • Influenza A (H3N2) [14]
    Fourteen viruses were related to A/Perth/16/2009-like (H3N2), the influenza A (H3N2) component of the 2010-2011 influenza vaccine for the Northern Hemisphere.
  • Influenza B [7]
    • Victoria lineage [7]
      Seven influenza B viruses were related to B/Brisbane/60/2008-like, the influenza B component of the 2010-2011 influenza vaccine for the Northern Hemisphere.
    • Yamagata lineage [0]
      No influenza B viruses of the Yamagata lineage have been characterized since 2009.

 

The national antigenic characterization and antiviral resistance testing results may be found in the final 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 July 2010, CDC has not reported any antiviral resistance testing results on influenza isolates received from Texas laboratories.

 

 

Influenza–Associated Pediatric Mortality

No influenza-associated pediatric deaths were reported during week 52. One influenza-associated pediatric fatality has been reported in Texas since the beginning of the 2010-2011 influenza season. Seven deaths have been reported during calendar year 2010. Please see the table below for more information.

 

 

Month of
Pediatric death,
2010
Influenza Type A Total
Influenza
Type B
Total,
All Influenza
Types and
Subtypes
Subtypes Total
Influenza A,
All Subtypes
2009
H1N1
Other
H1N1
H3N2 Not Subtyped
January 0 0 0 0 0 0 0
February 1 0 0 1 2 0 2
March 2 0 0 1 3 0 3
April 0 0 0 0 0 0 0
May 0 0 0 0 0 0 0
June 0 0 0 1 1 0 1
July 0 0 0 0 0 0 0
August 0 0 0 0 0 0 0
September 0 0 0 0 0 0 0
October 0 0 0 1 1 0 1
November 0 0 0 0 0 0 0
December 0 0 0 0 0 0 0
Unknown 0 0 0 0 0 0 0
Total 3 0 0 4 7 0 7


Cases of influenza-associated pediatric mortality (children <18 years of age) are reportable year-round and by law in Texas. Please see http://www.dshs.state.tx.us/idcu/investigation/conditions/ for more information.

 

Influenza-Associated Deaths in Pregnant and Postpartum Women

No new influenza-associated deaths were reported in pregnant or postpartum women during week 52.

DSHS is requesting reporting of influenza-associated deaths in pregnant or postpartum (up to 6 weeks) women during the summer of 2010 and continuing throughout the 2010-2011 influenza season. There has been 1 death reported since the beginning of the summer 2010. All influenza types and subtypes should be reported; a positive rapid influenza test is sufficient for confirmation.

 

 

School Closures and Institutional Outbreaks

No school closures or institutional outbreaks were reported during week 52. Information on the control of influenza in various settings may be found on the CDC website at http://www.cdc.gov/flu/professionals/infectioncontrol/.

 

 

U.S. Outpatient Influenza-like Illness Surveillance Network

Fifty-one 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 52. Of the 45 providers who saw patients, 33 (73%) saw at least one patient with ILI. Of all patient visits during this week, 3.37% were due to ILI. The Texas ILI baseline is 6.09% for the 2010-2011 season. The ILI baseline for HHS Region 6 (Arkansas, Louisiana, New Mexico, Oklahoma, and Texas) of the United States is 4.9% for the 2010-2011 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. The baselines displayed on the graph below were calculated for the official influenza reporting season only (approximately October to May).

 


Percentage of Visits for Influenza–Like Illness Reported by
the US Outpatient Influenza–Like Illness Surveillance Network (ILINet) in Texas
1/7/2011 9:30:00 AM
Week # Reporting Age 0-4 Age 5-24 Age 25-49 Age 50-64 Age 65 and older Total ILI Total Patients % ILI
2011-40 95 375 373 209 55 27 1039 36963 2.81%
2011-41 95 401 385 193 53 19 1051 37478 2.80%
2011-42 96 370 443 202 36 22 1073 38588 2.78%
2011-43 94 393 423 189 59 37 1101 37297 2.95%
2011-44 97 399 520 190 66 29 1204 38228 3.15%
2011-45 95 433 547 189 67 35 1271 38631 3.29%
2011-46 92 370 462 181 46 35 1094 36346 3.01%
2011-47 87 423 304 153 36 27 943 27150 3.47%
2011-48 89 502 425 199 75 34 1235 35816 3.45%
2011-49 87 303 526 217 43 24 1113 34215 3.25%
2011-50 79 342 557 193 59 23 1174 32192 3.65%
2011-51 68 371 510 277 74 36 1268 24429 5.19%
2011-52 51 191 152 120 29 22 514 15263 3.37%

Ili Percentage Chart

 

Ili Data 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.

 

 

US Map

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

 


The CDC compiles information from several sources and releases an international influenza summary. This report can be found at http://www.cdc.gov/flu/international/activity.htm.

 

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Last updated March 21, 2011