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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


    E-mail

2011-2012 DSHS Flu Report Week 01

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2011 - 2012 Texas Influenza Surveillance Information

Current Flu Activity Report in PDF Format

During week 1 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 see http://www.cdc.gov/flu/weekly/fluactivitysurv.htm and the national FluView weekly report at http://www.cdc.gov/flu/weekly/.
  • Ten specimens tested by NREVSS laboratories in Texas were positive for influenza. Two specimens were positive for 2009 influenza A (H1N1), one specimen was positive for influenza A (H3N2), one specimen was positive for influenza A (not subtyped), and one specimen was positive for influenza B by PCR test. All other positive tests were antigen detection tests. Two other laboratories in Texas reported positive PCR tests for influenza A (H3N2) 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 institutional outbreaks or school closures were reported.

Reports from Health Service Regions

Reports were received from all Health Service Regions (HSRs) for week 1. HSRs 1 and 2/3 reported an increased level of flu activity compared to week 52. HSR 11 reported a decreased level of flu activity compared to week 52. All other HSRs reported the same level of flu activity compared to week 52. 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 1, ten hospital laboratories and public health agencies across Texas reported conducting a total of 1,057 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-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 1

No. of specimens tested 1,057
No. of positive specimens (%) 10 (0.95%)
Positive specimens by type/subtype
Influenza A 8 (80%)
          Subtyping performed

 3 (37.5%)

                A (2009 H1N1)

 2 (66.7%)

                A (other H1N1)

 0 (0%)

                A (H3N2)

 1 (33.3%)

           Subtyping not performed

 5 (62.5%)

Influenza B

 2 (20%)

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 1 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

351

7

1.99%

HMPV

6

328

28

8.54%

Parainfluenza virus

5

349

5

1.43%

Rhinovirus

5

320

54

16.88%

RSV

20

1,138

411

36.12%

Antigenic Characterization

Since October 2, 2011, CDC has reported antigenic characterization results from 1 influenza A (H3N2) virus received from the Texas Department of State Health Services (DSHS) Laboratory.

  • Influenza A (H1N1) [0]
        
    No influenza A (H1N1) viruses from the Texas DSHS Laboratory have been characterized since 
        
    the 2010-2011 season.
  • Influenza A (H3N2) [1] 
        
    One virus was related to A/Perth/16/2009-like (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 deaths were reported during week 1.  No 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

0

0

0

0

Total

0

0

0

0

0

0

0

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 were reported for week 1. 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-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 1. Of the 40 providers who saw patients, 21 (52%) saw at least one patient with ILI. Of all patient visits during this week, 2.50% 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
1/12/2012 3:29:00 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

64 228 314 250 71 24 887 27730 3.20%

2011-47

66 211 229 197 48 23 708 22039 3.21%

2011-48

60 234 256 206 66 22 784 25044 3.13%

2011-49

59 235 190 134 39 25 623 19064 3.27%

2011-50

59 219 250 198 62 20 749 22736 3.29%

2011-51

53 221 192 186 54 18 671 20422 3.29%
2011-52 50 145 153 174 72 15 559 19166 2.92%
2012-01 42 142 163 171 41 14 531 21230 2.50%

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;

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Last updated September 28, 2012