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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 52

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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 52 in Texas: 

  • The influenza (flu) activity level (geographic spread of influenza) for Texas was “widespread” 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/.
  • Four hundred thirty (25.9%) specimens tested by NREVSS laboratories in Texas were positive for influenza.
  • The percentage of visits for influenza-like illness (ILI) as reported by ILINet providers was 11.93%, which is above the Texas baseline.
  • No influenza-associated pediatric deaths were reported.
  • Three influenza outbreaks were reported.
  • No variant influenza viruses were reported.

Reports from Health Service Regions

Reports were received from all Health Service Regions (HSRs) for week 52. HSRs 6/5S, 8, and 9/10 reported the same level of flu activity compared to week 51. HSR 2/3 reported a decreased level of flu activity compared to week 51. All other HSRs reported an increased 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, four hospital laboratories and public health agencies across Texas reported conducting a total of 1,663 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-nine 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 52

No. of specimens tested

1,663

No. of positive specimens (%) 430 (25.9%)
Positive specimens by type/subtype
Influenza A

233 (54.2%)

          Subtyping performed

66 (28.3%)

                A (2009 H1N1)

0 (0%)

                A (other H1N1)

0 (0%)

                A (H3N2)

66 (100%)

           Subtyping not performed

167 (71.7%)

Influenza B

197 (45.8%)

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 52 are summarized below. (Two 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)

4

596

7

1.17%

HMPV

4

412

10

2.43%

Parainfluenza

4

596

25

4.19%

Rhinovirus

3

393

97

24.68%

RSV

6

558

140

25.09%

Antigenic Characterization
Since September 1, 2012, CDC has reported antigenic characterization results from one influenza A (H1N1) virus, seven influenza A (H3N2) viruses, and 13 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. This virus strain was included in the 2012-2013 influenza vaccine for the Northern Hemisphere.
  •  Influenza A (H3N2) [7] 
    Seven 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 [13]
    Thirteen 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
    No influenza-associated pediatric deaths were reported during week 52. Three 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

1

1

Total

0

0

1

0

1

2

3


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
Three influenza outbreaks were reported during week 52. The first outbreak began in week 51 in a school in HSR 7. The school reported high absenteeism, influenza-like illnesses (ILI), and confirmed cases of influenza B. Two outbreaks in HSR 7 nursing homes were also reported. In one nursing home, four of the nine ILI cases tested positive for influenza B; in the second nursing home, rapid tests were positive for influenza A. 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
Thirty-seven providers in Texas reported data to the U.S. Outpatient Influenza-like Illness Surveillance Network (ILINet) on patients with influenza-like illness (ILI) and total patients seen for any reason during week 52. Of the 34 providers who saw patients, 30 (88%) saw at least one patient with ILI. Of all patient visits during this week, 11.93% 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
1/03/2013 11:00:00 AM

Week

# Reports

Age 0-4 Age 5-24 Age 25-49 Age 50-64 Age 65 + Total ILI Total Patients % ILI

2012-40

57 224 328 179  34 7 772 26679 2.89%
2012-41 55 244 406 184 64 23 921 26566 3.47%
2012-42 58 212 357 113 31 13 726 26323 2.76%
2012-43 58 294 386 167 43 26 916 25637 3.57%
2012-44 58 287 424 204 43 21 979 25449 3.85%
2012-45 59 324 549 222 60 21 1176 26801 4.39%
2012-46 56 321 506 195 52 13 1087 25679 4.23%
2012-47 57 338 609 345 122 31 1445 20773 6.96%
2012-48 56 313 606 367 108 40 1434 27781 5.16%
2012-49 56 399 888 454 119 44 1904 27669 6.88%
2012-50 54 375 994 427 131 53 1980 26478 7.48%
2012-51 42 351 1077 723 219 73 2443 23500 10.40%
2012-52 37 299 816 756 274 78 2223 18627 11.93%

ILI Percentage Chart

ILI Data Chart

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; 12/08/12; 12/15/12; 12/22/12; 12/29/12;

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Last updated January 04, 2013