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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 15

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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 15 in Texas:

  • The influenza (flu) activity level (geographic spread of influenza) for Texas was “local” and the ILINet Activity Level Indicator (intensity of influenza-like illness) was “minimal”. For more information please seehttp://www.cdc.gov/flu/weekly/fluactivitysurv.htm and the national FluView weekly report at http://www.cdc.gov/flu/weekly/.
  • Forty-five specimens tested by NREVSS laboratories in Texas were positive for influenza. Three 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 was below the HHS regional baseline and the Texas baseline.
  • No 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 15. HSRs 7 and 9/10 reported a decreased level of flu activity compared to week 14. All other HSRs reported the same level of flu activity compared to week 14 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 15, nine hospital laboratories and public health agencies across Texas reported conducting a total of 811 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. 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 15

No. of specimens tested 811
No. of positive specimens (%) 45 (5.55%)
Positive specimens by type/subtype
Influenza A 25 (55.56%)
          Subtyping performed

 3 (12.%)

                A (2009 H1N1)

 3 (100.0%)

                A (other H1N1)

 0 (0%)

                A (H3N2)

 0 (0.0%)

           Subtyping not performed

 22 (88%)

Influenza B

 20 (44.44%)

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 15 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)

6

418

6

1.44%

HMPV

5

367

11

3.00%

Parainfluenza virus

6

537

15

2.79%

Rhinovirus

3

216

109

50.46%

RSV

16

658

27

4.10%

Antigenic Characterization

Since October 2, 2011, CDC has reported antigenic characterization results from five influenza A (H3N2) viruses, three influenza A (H1N1) viruses, and two 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 (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 [2] 
    • One (50%) virus was related to B/Brisbane/60/2008 (B/Victoria lineage). This influenza B lineage was included in the 2011-2012 influenza vaccine for the Northern Hemisphere.
    • One (50%) 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

Reports received from CDC for the 2011-2012 influenza season indicate that eight 2009 influenza A (H1N1) isolates from Texas were positive for the mutation that confers resistance to oseltamivir. Two additional 2009 influenza A (H1N1) isolates with the mutation were identified through diagnostic testing performed at the CDC.

For more information on antiviral medications please see http://www.cdc.gov/flu/professionals/antivirals/index.htm

Influenza–Associated Pediatric Mortality

No influenza-associated pediatric deaths were reported during week 15. 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

April

0

0

0

0

0

0

0

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 15. 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

Twenty-six 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 15. Of the 26 providers who saw patients, 13 (50%) saw at least one patient with ILI. Of all patient visits during this week, 2.68% 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
4/19/2012 8:45:00 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 69 325 477 322 79 18 1221 28782 4.24%
2012-08 68 369 416 207 67 29 1088 21153 5.14%
2012-09 67 282 536 418 104 39 1379 28784 4.79%
2012-10 64 230 387 191 58 32 898 19348 4.64%
2012-11 64 299 428 372 98 30 1227 22558 5.44%
2012-12 64 288 420 287 75 30 1100 26688 4.12%
2012-13 59 210 436 277 68 13 1004 25236 3.98%
2012-14 50 220 385 207 42 13 867 22948 3.78%
2012-15 26 69 97 81 11 4 262 9787 2.68%

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;
3/24/12; 3/31/12; 4/7/12; 4/14/12;

 

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Last updated September 28, 2012