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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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2011-2012 DSHS Flu Report Week 11

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Current Flu Activity Report in PDF Format

Please note: The 2011-2012 influenza season began on October 2, 2011. For reports from the 2010-2011 season, please see http://www.dshs.state.tx.us/idcu/disease/influenza/surveillance/2011/.

During week 11 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 “moderate”. 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/.
  • Two hundred eighty-seven specimens tested by NREVSS laboratories in Texas were positive for influenza. Twenty-eight specimens were positive for influenza by PCR test or viral culture. All other positive tests were antigen detection tests.
  • The percentage of visits for influenza-like illness as reported by ILINet providers in Texas exceeded the HHS regional baseline but remained below the Texas baseline.
  • Two influenza-associated pediatric deaths were reported.
  • No outbreaks of influenza or ILI were reported.

Reports from Health Service Regions

Reports were received from all Health Service Regions (HSRs) for week 11. HSR 1 reported an increased level of flu activity compared to week 10. HSR 2/3 reported a decreased level of flu activity compared to week 10. HSR 9/10 was not sure of the flu activity level compared to week 10. All other HSRs reported the same level of flu activity compared to week 10.  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 11, eight hospital laboratories and public health agencies across Texas reported conducting a total of 1,634 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). Eighty-two 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 11

No. of specimens tested 1,634
No. of positive specimens (%) 287 (17.6%)
Positive specimens by type/subtype
Influenza A 251 (87.5%)
          Subtyping performed

 20 (8.0%)

                A (2009 H1N1)

 18 (90.0%)

                A (other H1N1)

 0 (0%)

                A (H3N2)

 2 (10.0%)

           Subtyping not performed

 231 (92.0%)

Influenza B

 36 (12.5%)

Influenza results (antigen detection, culture, and PCR) from NREVSS reporters for the 2011–12 season are presented in the graph below.

Flu Type Count

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 11 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)

5

425

9

2.12%

HMPV

5

398

59

14.82%

Parainfluenza virus

5

556

8

1.44%

Rhinovirus

3

224

72

32.14%

RSV

19

865

158

18.27%

Antigenic Characterization

Since October 2, 2011, CDC has reported antigenic characterization results from five influenza A (H3N2) viruses, one influenza A (H1N1) virus, and one influenza B virus received from the Texas Department of State Health Services (DSHS) Laboratory.

  • Influenza A (H1N1) [1]
    • One virus was related to A/California/07/2009 (H1N1), the influenza A (H1N1) component of the 2011-2012 influenza vaccine for the Northern Hemisphere.
  • Influenza A (H3N2) [5] 
    • Four (80%) viruses were related to A/Perth/16/2009 (H3N2), the influenza A (H3N2) component of the 2011-2012 influenza vaccine for the Northern Hemisphere.
    • One (20%) virus showed reduced titers with antiserum produced against A/Perth/16/2009.
  • Influenza B [1]
        One virus was related to B/Wisconsin/01/2010 (B/Yamagata lineage). This influenza B lineage was not included in the 2011-2012 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

The DSHS Laboratory has not received any antiviral resistance testing results from CDC so far this season.
For more information on antiviral medications please see http://www.cdc.gov/flu/professionals/antivirals/index.htm

Influenza–Associated Pediatric Mortality

Two influenza-associated pediatric deaths were reported during week 11. The first death occurred during week 9 in an 8-year-old resident of HSR 1 with underlying medical conditions. A specimen collected from the child was positive for influenza A (not subtyped) by rapid test. It is unknown if the child was vaccinated for influenza for the current season. The second death occurred during week 10 in a 10-year-old resident of HSR 7 with underlying medical conditions. A specimen collected from the child was positive for influenza A (not subtyped) by rapid test. The child had not received an influenza vaccine for the 2011-12 influenza season. Three influenza-associated pediatric fatalities have been reported in Texas since the beginning of the 2011-2012 influenza season. Please see the table below for more information

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

2011

October

0

0

0

0

0

0

0

November

0

0

0

0

0

0

0

December

0

0

0

0

0

0

0

2012

January

0

0

0

1

1

0

1

February   

0

0

0

0

0

0

0

March

0

0

0

2

2

0

2

Total

0

0

0

3

3

0

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

No institutional outbreaks or school closures were reported during week 11. Information on the control of influenza in various settings may be found on the CDC website athttp://www.cdc.gov/flu/professionals/infectioncontrol/

U.S. Outpatient Influenza-like Illness Surveillance Network

Fifty-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 11. Of the 48 providers who saw patients, 30 (62%) saw at least one patient with ILI. Of all patient visits during this week, 5.68% were due to ILI. The Texas ILI baseline is 5.87% for the 2011–2012 season. The ILI baseline for HHS Region 6 (Arkansas, Louisiana, New Mexico, Oklahoma, and Texas) of the United States is 4.3% for the 2011–2012 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
3/23/2012 9:40:00 AM

 Week

# Reports

 Age
0-4

 Age
5-24

Age
25-49

Age
50-64

Age
65 +

 Total
ILI

Total
Patients

 %
ILI

2011-40

70

188 

297 

202

58

18

763

27935 

 2.73%

2011-41

69

200

243

181

52

12

688

28089

2.45%

2011-42

71

202

305

196

62

19

784

26341

2.98%

2011-43

70

227

306

225

50

17

825

28150

2.93%

2011-44

70 206 300 187 56 13 762 27888 2.73%

2011-45

71 241 305 234 53 24 857 28619 2.99%

2011-46

67 234 318 250 71 24 897 28711 3.12%

2011-47

69 215 232 197 48 23 715 22669 3.15%

2011-48

66 238 259 207 66 22 792 26510 2.99%

2011-49

65 238 196 134 39 25 632 20322 3.11%

2011-50

65 228 256 198 62 20 764 24240 3.15%

2011-51

62 253 213 207 66 30 769 22055 3.49%
2011-52 64 196 194 209 83 16 698 21310 3.28%
2012-01 69 221 226 212 48 18 725 25908 2.80%
2012-02 69 249 287 197 72 33 838 26364 3.18%
2012-03 68 269 325 235 49 21 899 26524 3.39%
2012-04 70 235 357 209 67 11 879 26710 3.29%
2012-05 68 312 380 240 72 17 1021 24822 4.11%
2012-06 68 288 442 272 63 20 1085 30744 3.53%
2012-07 68 325 477 322 79 17 1220 28678 4.25%
2012-08 67 369 416 207 67 29 1088 21056 5.17%
2012-09 64 282 536 418 104 39 1379 28525 4.83%
2012-10 59 228 382 191 58 32 891 18716 4.76%
2012-11 53 293 400 364 89 27 1173 20658 5.68%

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.

  

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

 
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.


2011 - 2012 Texas Influenza Surveillance Information --- Flu Reports

For the week ending: 10/08/11; 10/15/11; 10/22/11; 10/29/11; 11/05/11; 11/12/11;
11/17/11; 11/24/11; 12/03/11; 12/11/11; 12/18/11; 12/25/11; 12/31/11; 1/7/12;
1/14/12; 1/21/12; 1/28/12;  2/4/12; 2/11/12; 2/18/122/25/12; 3/3/12; 3/10/12; 3/17/12;

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Last updated September 28, 2012