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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_47

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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 47 in Texas:

  • The influenza (flu) activity level (geographic spread of influenza) for Texas was "sporadic" 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/.
  • Sixty-five (7.1%) specimens tested by NREVSS laboratories in Texas were positive for influenza. Two specimens were positive for 2009 influenza A (H1N1), six specimens were positive for influenza A (H3N2), two specimens were positive for influenza A (not subtyped), and one specimen was 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 47. HSR 11 reported an increased level of flu activity compared to week 46. All other HSRs reported the same level of flu activity compared to week 46. 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 47, ten hospital laboratories and public health agencies across Texas reported conducting a total of 911 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). Sixty-eight 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 47
No. of specimens tested 911
No. of positive specimens (%) 65 (7.1%)
Positive specimens by type/subtype
Influenza A 57 (87.7%)
          Subtyping performed 8 (14%)
                 A (2009 H1N1) 2 (25%)
                 A (other H1N1) 0 (0%)
                 A (H3N2) 6 (75%)
           Subtyping not performed 49 (86%)
Influenza B 8 (12.3%)

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 47 are summarized below.

 

Virus Number of
Laboratories
Testing
Tests
Performed
Positive
Tests
Percentage
of Tests
Positive
Adenovirus (respiratory) 6 297 15 5.05%
HMPV 5 247 2 0.81%
Parainfluenza 5 296 5 1.59%
Rhinovirus 4 233 58 24.89%
RSV 19 900 123 13.67%

Antigenic Characterization

Since July 2010, CDC has reported antigenic characterization results from 1 influenza A (H1N1) virus, 4 influenza A (H3N2) viruses, and 3 influenza B viruses received from the Texas Department of State Health Services (DSHS) Laboratory.

  • Influenza A (H1N1) [1]
    One virus was 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) [4]
    Four 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 [3]
    • Victoria lineage [3]
      Three 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 47. 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
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 47.

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 47. 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

Sixty-three 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 47. Of the 63 providers who saw patients, 36 (57%) saw at least one patient with ILI. Of all patient visits during this week, 3.17% 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
12/2/2010 5:05:00 PM
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 92 366 354 208 54 26 1008 33386 3.02%
2011-41 92 384 367 193 53 19 1016 34435 2.95%
2011-42 93 358 426 202 36 22 1044 34335 3.04%
2011-43 91 376 412 188 59 37 1072 33698 3.18%
2011-44 93 388 497 190 66 29 1170 34207 3.42%
2011-45 88 413 504 184 67 35 1203 34015 3.54%
2011-46 78 320 389 160 44 34 947 31226 3.03%
2011-47 63 234 116 58 17 11 436 13754 3.17%



Percentage of ili Week 47
Percentage Ili Week 47

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.


International Influenza Activity Map

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.

International

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Last updated March 21, 2011