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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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2010-2011 DSHS Flu Report Week 7

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2010 - 2011 Texas Influenza Surveillance Information

Please note: The 2010-2011 influenza season began on October 3, 2010. For reports from the 2009-2010 season, please see http://www.dshs.state.tx.us/idcu/disease/influenza/surveillance/2010/.

During week 7 in Texas:

  • The influenza (flu) activity level (geographic spread of influenza) for Texas was "widespread" and the ILINet Activity Level Indicator was "high". For more information please see http://www.cdc.gov/flu/weekly/fluactivity.htm and the national FluView weekly report at http://www.cdc.gov/flu/weekly/
  •  Five hundred eighty (32.4%) specimens tested by NREVSS laboratories in Texas were positive for influenza. Sixty-two specimens were positive for 2009 influenza A (H1N1), 108 specimens were positive for influenza A (H3N2), 46 specimens were positive for influenza A (not subtyped), and 68 specimens were positive for influenza B by viral culture or PCR testing; the remaining positive results were obtained by antigen detection test.
  • The percentage of visits for influenza-like illness as reported by ILINet providers in Texas exceeded the regional baseline and the state baseline.
  • Two influenza-associated pediatric deaths were reported.
  • One institutional outbreak was reported.

Reports from Health Service Regions

Reports were received from all Health Service Regions (HSRs) for week 7. HSRs 4/5N, 6/5S, 7, and 11 reported an increased level of flu activity compared to week 6.  HSRs 1, 2/3, 8, and 9/10 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, six hospital laboratories and public health agencies across Texas reported conducting a total of 1,789 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.

 

 

Influenza Testing Results Reported by Texas NREVSS Laboratories
Testing Information Week 7
No. of specimens tested 1,789
No. of positive specimens (%) 580 (32.4%)
Positive specimens by type/subtype
Influenza A 406 (70%)
          Subtyping performed 170 (41.9%)
                 A (2009 H1N1) 62 (36.5%)
                 A  (Seasonal H1) 0 (0%)
                 A (H3N2) 108 (63.5%)
           Subtyping not performed 236 (58.1%)
Influenza B 174 (30%)

Additional influenza test results (rapid tests, culture, PCR) were reported from providers and public health departments throughout the state (see county map below). 

Other Respiratory Viruses

The NREVSS system collects information on a variety of respiratory viruses in addition to influenza including parainfluenza, respiratory syncytial virus (RSV), rhinovirus, human metapneumovirus (HMPV), and respiratory adenovirus. The results from week 7 are summarized 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) 3 303 8 2.64%
HMPV 3 246 6 2.44%
Parainfluenza 3 303 12 3.96%
Rhinovirus 2 233 38 16.31%
RSV 11 839 180 21.45%

Antigenic Characterization

Since July 2010, CDC has reported antigenic characterization results from 3 influenza A (H1N1) viruses, 17 influenza A (H3N2) viruses, and 11 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-like (H1N1), the influenza A (H1N1) component of the 2010-2011 influenza vaccine for the Northern Hemisphere.
  • Influenza A (H3N2) [17]
    Seventeen viruses were related to A/Perth/16/2009-like (H3N2), the influenza A (H3N2) component of the 2010-2011 influenza vaccine for the Northern Hemisphere.
  • Influenza B [11]
    • Victoria lineage [11]
      Eleven influenza B viruses were related to B/Brisbane/60/2008-like, the influenza B component of the 2010-2011 influenza vaccine for the Northern Hemisphere.
    • Yamagata lineage [0]
      No influenza B viruses of the Yamagata lineage have been characterized since 2009. 

The national antigenic characterization and antiviral resistance testing results may be found in the final CDC weekly flu report at www.cdc.gov/flu/weekly/. The DSHS Laboratory sends a representative sample of influenza viruses to the CDC throughout the flu season. 

Antiviral Resistance

Since July 2010, CDC has not reported any antiviral resistance testing results on influenza isolates received from Texas laboratories. 

Influenza–Associated Pediatric Mortality

No new influenza-associated pediatric fatalities were reported during week 41. There have been no influenza-associated pediatric fatalities reported in Texas since the beginning of the 2010-2011 influenza season. Six deaths have been reported during calendar year 2010. Please see the table below for more information. 

 

Influenza-Associated Pediatric Deaths in Texas Residents by Type, Subtype, and Month
Month of
Pediatric death,
2010
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
January 0 0 0 0 0 0 0
February 1 0 0 1 2 0 2
March 2 0 0 1 3 0 3
April 0 0 0 0 0 0 0
May 0 0 0 0 0 0 0
June 0 0 0 1 1 0 1
July 0 0 0 0 0 0 0
August 0 0 0 0 0 0 0
September 0 0 0 0 0 0 0
October 0 0 0 0 0 0 0
Unknown 0 0 0 0 0 0 0
Total 3 0 0 3 6 0 6


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.  

Influenza-Associated Deaths in Pregnant and Postpartum Women

No influenza-associated deaths were reported in pregnant or postpartum women during week 7.

 

DSHS is requesting reporting of influenza-associated deaths in pregnant or postpartum (up to 6 weeks) women during the summer of 2010 and continuing throughout the 2010-2011 influenza season. There has been 1 death reported since the beginning of the summer 2010. All influenza types and subtypes should be reported; a positive rapid influenza test is sufficient for confirmation. 

School Closures and Institutional Outbreaks

One institutional outbreak occurred in a long-term care facility in HSR 7 during week 6 and was reported during week 7. Twelve to fifteen residents and a few staff members became ill with influenza or influenza-like illness (ILI); several of the residents tested positive for influenza A (not subtyped) via rapid test. All of the ill persons have recovered. 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

Sixty-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 62 providers who saw patients, 56 (90%) saw at least one patient with ILI. Of all patient visits during this week, 9.37% were due to ILI. The Texas ILI baseline is 6.09% for the 2010-2011 season. The ILI baseline for HHS Region 6 (Arkansas, Louisiana, New Mexico, Oklahoma, and Texas) of the United States is 4.9% for the 2010–2011 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
(2/24/2011 11:30:00 AM)
Week # Reporting Age 0-4 Age 5-24 Age 25-49 Age 50-64 Age 65 and older Total ILI Total Patients % ILI
2011-40 96 375  375  209  55 27 1041 37659 2.76%
2011-41 95  400 388  118193 53 19 1052 37478 2.81%
2011-42

96

374

442

202

36

22

1076

38588

2.79%

2011-43

94

395

427

189

59

37

1107

37297

2.97%

2011-44

97

398

524

190

66

29

1207

38228

3.16%

2011-45

95

437

550

189

67

35

1278

38631

3.31%

2011-46

92

372

470

181

46

35

1104

36346

3.04%

2011-47

88

429

308

153

36

27

953

27189

3.51%

2011-48

92

504

438

199

75

35

1251

35925

3.48%

2011-49

91

306

537

220

43

24

1130

34832

3.24%

2011-50

86

395

604

219

67

27

1312

33879

3.87%

2011-51

78

408

555

293

86

42

1383

26225

5.27%

2011-52

78

397

372

341

89

51

1250

28849

4.33%

2011-01

88

500

520

307

80

55

1462

33327

4.39%

2011-02

88

577

770

365

99

55

1866

34400

5.42%

2011-03

90

680

1028

491

143

54

2396

38729

6.19%

2011-04

92

725

1363

677

161

63

2989

41495

7.20%

2011-05

88

590

1293

651

147

62

2743

32628

8.41%

2011-06

79

562

1326

867

193

55

3003

37513

8.01%

2011-07

62

451

1176

623

162

47

2459

26237

9.37%

 

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

Influenza in USA Map

*This map indicates geographic spread and does not measure the severity of influenza activity. 

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 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.


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Last updated June 03, 2011