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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 07

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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 7 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 “minimal”.  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/.
  • Sixty-four specimens tested by NREVSS laboratories in Texas were positive for influenza. Fifteen specimens were positive for 2009 influenza A (H1N1), four specimens were positive for influenza A (H3N2), four specimens were positive for influenza A (not subtyped), and four specimens were positive for influenza B by PCR test. All other positive tests were antigen detection tests. Nine additional laboratories in Texas reported positive PCR tests for 2009 influenza A (H1N1), influenza A (H3N2), influenza A (not subtyped), and influenza B.
  • The percentage of visits for influenza-like illness as reported by ILINet providers in Texas was below the state and HHS regional baselines.
  • No influenza-associated pediatric deaths were reported.
  • No school or institutional outbreaks of ILI or influenza were reported.

Reports from Health Service Regions

Reports were received from all Health Service Regions (HSRs) for week 7. HSRs 1 and 2/3 reported an increased level of flu activity compared to week 6. All other HSRs reported the same level of flu activity compared to week 6. 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 7, eight hospital laboratories and public health agencies across Texas reported conducting a total of 875 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). Fifty-five 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 7

No. of specimens tested 875
No. of positive specimens (%) 64 (7.31%)
Positive specimens by type/subtype
Influenza A 54 (84.4%)
          Subtyping performed

 19 (35.2%)

                A (2009 H1N1)

 15 (78.9%)

                A (other H1N1)

 0 (0%)

                A (H3N2)

 4 (21.1%)

           Subtyping not performed

 35 (64.8%)

Influenza B

 10 (15.6%)

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

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 7 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)

3

373

5

1.34%

HMPV

3

226

29

12.83%

Parainfluenza virus

3

373

4

1.07%

Rhinovirus

3

226

76

33.63%

RSV

16

892

247

27.69%

Flu Type Count

Antigenic Characterization

Since October 2, 2011, CDC has reported antigenic characterization results from four influenza A (H3N2) viruses and one influenza A (H1N1) 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) [4] 
        Four viruses were related to A/Perth/16/2009 (H3N2), the influenza A (H3N2) component of the 2011-2012 influenza vaccine for the Northern Hemisphere
    .
  • Influenza B [0]
        
    No influenza B viruses from the Texas DSHS Laboratory have been characterized since 
        
    the 2010-2011 season.

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

No influenza-associated pediatric fatalities were reported during week 7. One influenza-associated pediatric fatality has 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

Total

0

0

0

1

1

0

1

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 school closures or institutional outbreaks due to ILI or influenza were reported during week 7. 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-two 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 7. Of the 52 providers who saw patients, 33 (63%) saw at least one patient with ILI. Of all patient visits during this week, 4.11% 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
2/23/2012 1:50:00 PM

 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

69

223

304

225

50

17

819

27504

2.98%

2011-44

69 201 298 187 56 13 755 27209 2.77%

2011-45

70 233 296 234 53 24 840 27898 3.01%

2011-46

65 228 314 250 71 24 887 27769 3.19%

2011-47

67 211 229 197 48 23 708 22076 3.21%

2011-48

64 234 257 207 66 22 786 25598 3.07%

2011-49

63 235 191 134 39 25 624 19579 3.19%

2011-50

63 219 253 198 62 20 752 23434 3.21%

2011-51

60 241 208 207 66 30 752 21290 3.53%
2011-52 62 187 191 209 83 16 686 20677 3.32%
2012-01 66 216 222 212 48 18 716 25104 2.85%
2012-02 66 245 281 197 72 33 828 25509 3.25%
2012-03 65 261 314 235 49 21 880 25535 3.45%
2012-04 66 225 348 209 67 11 860 25673 3.35%
2012-05 62 297 369 238 72 17 993 23450 4.23%
2012-06 61 279 424 272 63 20 1058 27222 3.89%
2012-07 52 233 400 287 56 10 986 23983 4.11%

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; 2/18/12

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Last updated September 28, 2012