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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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2012-2013 DSHS Flu Report Week 48

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Current Flu Activity Report in PDF Format

Please note: The 2012-2013 influenza season began on September 30, 2012. For reports from the 2011-2012 season, please see http://www.dshs.state.tx.us/idcu/disease/influenza/surveillance/2012/.      

During week 48 in Texas: 

  • The influenza (flu) activity level (geographic spread of influenza) for Texas was “regional” and the ILINet Activity Level Indicator (intensity of influenza-like illness) was “high”.  For more information please see http://www.cdc.gov/flu/weekly/fluactivitysurv.htm and the national FluView weekly report at http://www.cdc.gov/flu/weekly/.
  • Three hundred (15.2%) specimens tested by NREVSS laboratories in Texas were positive for influenza.
  • The percentage of visits for influenza-like illness as reported by ILINet providers was 6.10%, which is above the Texas baseline.
  • One influenza-associated pediatric death was reported.
  • One influenza outbreak was reported.
  • No variant influenza viruses were reported.

Reports from Health Service Regions

Reports were received from all Health Service Regions (HSRs) for week 48. HSRs 1, 2/3, 4/5N, 7, 9/10, and 11 reported an increased level of flu activity compared to week 47. All other HSRs reported the same level of flu activity compared to week 47. 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 48, eleven hospital laboratories and public health agencies across Texas reported conducting a total of 1,974 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-one 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. 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)  

Influenza Testing Results Reported by Texas NREVSS Laboratories

Testing Information

Week 48

No. of specimens tested

1,974

No. of positive specimens (%) 300 (15.2%)
Positive specimens by type/subtype
Influenza A

156 (52%)

          Subtyping performed

62 (39.7%)

                A (2009 H1N1)

1 (1.6%)

                A (other H1N1)

0 (0%)

                A (H3N2)

61 (98.4%)

           Subtyping not performed

94 (60.3%)

Influenza B

144 (48%)

Influenza results (antigen detection, culture, and PCR) from NREVSS reporters for the 2012–13 season are presented in the graph below.

NREVSS Positives Graph

Other Respiratory Viruses
The NREVSS system collects information on a variety of respiratory viruses in addition to influenza including parainfluenza virus, respiratory syncytial virus (RSV), rhinovirus, human metapneumovirus (HMPV), and respiratory adenovirus. The results from week 48 are summarized below. (Three non-NREVSS laboratories also contribute to the RSV data below.)

Other Respiratory Virus Results Reported by Texas NREVSS Laboratories

Virus

Number of Laboratories Testing

Tests Performed

Positive Tests

Percentage of Tests Positive

Adenovirus (respiratory)

7

854

22

2.58%

HMPV

5

527

9

1.71%

Parainfluenza

8

836

54

6.46%

Rhinovirus

3

360

105

29.17%

RSV

22

898

214

23.83%

Antigenic Characterization
Since September 1, 2012, CDC has reported antigenic characterization results from five influenza A (H3N2) viruses and ten influenza B viruses received from the Texas Department of State Health Services (DSHS) Laboratory. 

  • Influenza A (H1N1) [0]
    No influenza A (H1N1) viruses have been characterized during the current season.
  •  Influenza A (H3N2) [5] 
    Five viruses were related to A/Victoria/361/2011. This virus strain was included in the 2012-2013 influenza vaccine for the Northern Hemisphere.

  • Influenza B [10]
    Ten viruses were related to B/Wisconsin/01/2010 (B/Yamagata lineage). This influenza B lineage was included in the 2012-2013 influenza vaccine for the Northern Hemisphere.

 The national antigenic characterization and antiviral resistance testing 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.  

 

Antiviral Resistance
No antiviral resistance results for Texas for the 2012-2013 season are available at this time.
For more information on antiviral medications please see http://www.cdc.gov/flu/professionals/antivirals/index.htm

Variant Influenza Viruses
    No variant influenza viruses have been detected in Texas during 2012.

 

Influenza–Associated Pediatric Mortality
    One influenza-associated pediatric death occurred in a 9-year-old resident of HSR 2/3 during week 48. A specimen collected from the child was positive for influenza B by PCR testing. The child had an underlying medical condition and was not vaccinated for the current influenza season. Two influenza-associated pediatric deaths have been reported in Texas during the 2012-2013 influenza season. Please see the table below for more information

Influenza-Associated Pediatric Deaths in Texas Residents by Type, Subtype, and Month
Month of
Pediatric death 
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
2012
October

0

0

0

0

0

0

0

November

0

0

1

0

1

1

2

December

0

0

0

0

0

0

0

Total

0

0

1

0

1

1

2


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. 

School Closures and Institutional Outbreaks
One influenza outbreak was reported in an assisted living facility in HSR 7 during week 48. Some residents and staff members reported symptoms of ILI and two individuals tested positive for influenza by rapid test. 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
Forty-five 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 48. Of the 45 providers who saw patients, 34 (76%) saw at least one patient with ILI. Of all patient visits during this week, 6.10% were due to ILI. The ILI baseline for Texas is 4.77% for the 2012–2013 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. A “non-influenza week” is defined as a week that accounted for less than 2% of the season’s total number of specimens that tested positive for influenza.

Percentage of Visits for Influenza–Like Illness Reported by
the US Outpatient Influenza–Like Illness Surveillance Network (ILINet) in Texas
12/06/2012 12:31:00 PM

Week

# Reports

Age 0-4 Age 5-24 Age 25-49 Age 50-64 Age 65 + Total ILI Total Patients % ILI
2012-40 56 224 328 179  34 7 772 26673 2.89%
2012-41 54 244 406 184 64 23 921 26559 3.47%
2012-42 55 203 331 103 23 9 669 25992 2.57%
2012-43 55 275 371 147 34 16 843 25315 3.33%
2012-44 55 281 399 182 39 20 921 25116 3.67%
2012-45 56 316 539 209 55 18 1137 26533 4.29%
2012-46 53 315 489 180 48 9 1041 25352 4.11%
2012-47 53 313 588 329 109 26 1365 20433 6.68%
2012-48 45 312 582 368 108 40 1410 23114 6.10%

ILI Percentage Chart

ILI Data Graph

National Influenza Activity

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

 

International 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.

Texas Flu 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.


2012 - 2013 Texas Influenza Surveillance Information --- Flu Reports

For the week ending: 10/06/12; 10/13/12; 10/20/12; 10/27/12; 11/3/1211/10/12; 11/17/12; 11/24/12; 12/01/12;

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Last updated December 07, 2012