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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 15

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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 15 in Texas:

  • The influenza (flu) activity level (geographic spread of influenza) for Texas was “sporadic” and the ILINet Activity Level Indicator (intensity of influenza-like illness) was “minimal”.  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/
  • Twelve (3.5%) specimens tested by NREVSS laboratories in Texas were positive for influenza. One specimen was positive for 2009 influenza A (H1N1) and one specimen was 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 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 15. HSR 6/5S reported the same level of flu activity compared to week 14. All other HSRs reported a decreased 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, seven hospital laboratories and public health agencies across Texas reported conducting a total of 340 influenza tests (antigen, culture, and PCR) to the National Respiratory and Enteric Virus Surveillance System (NREVSSsponsored by the Centers for Disease Control and Prevention (CDC). Fifty-six 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 15
No. of specimens tested

340

No. of positive specimens (%)

12 (3.5%)

Positive specimens by type/subtype

Influenza A

10 (83.3%)

          Subtyping performed

1 (10%)

                 A (2009 H1N1)

1 (100%)

                 A  (Seasonal H1)

0 (0%)

                 A (H3N2)

0 (0%)

           Subtyping not performed

9 (90%)

Influenza B

2 (16.7%)

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 15 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) 3 146 3 2.05%
HMPV 3 120 8 6.67%
Parainfluenza 4 147 13 8.84%
Rhinovirus 2 110 41 37.27%
RSV 14 382 23 6.02%

Antigenic Characterization

Since October 3, 2010, CDC has reported antigenic characterization results from 12 influenza A (H1N1) viruses, 30 influenza A (H3N2) viruses, and 14 influenza B viruses received from the Texas Department of State Health Services (DSHS) Laboratory.

  • Influenza A (H1N1) [12]
    Twelve 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) [30]
    Thirty 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 [14]
    • Victoria lineage [14]
      Fourteen 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

No Texas influenza isolates tested so far in the 2010-2011 influenza season have demonstrated resistance to oseltamivir or zanamivir. Resistance to the adamantanes has been detected in most of the 2009 influenza A (H1N1) and influenza A (H3N2) isolates tested over the last two influenza seasons. 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.  Twelve influenza-associated pediatric fatalities have been reported in Texas since the beginning of the 2010-2011 influenza season. Eleven deaths have been reported during calendar year 2011. Please see the table below for more information

Influenza-Associated Pediatric Deaths in Texas Residents by Type, Subtype, and Month
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

2010

October 0 0 0 1 1 0 1
November 0 0 0 0 0 0 0
December 0 0 0 0 0 0 0

2011

January 0 0 1 1 2 1 3
February 2 0 1 2 5 0 5
March 1 0 0 1 2 1 3
Total 3 0 2 5 10 2 12


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 15.

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

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 at http://www.cdc.gov/flu/professionals/infectioncontrol/.

U.S. Outpatient Influenza-like Illness Surveillance Network

Fifty-nine 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 58 providers who saw patients, 30 (52%) saw at least one patient with ILI. Of all patient visits during this week, 2.44% 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
(4/25/2011 7:39:00 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 97 375  375  209  55 27 1041 37881 2.75%
2011-41 96  400 389  193 53 19 1054 37677 2.80%

2011-42

97

374

443

202

36

22

1077

38758

2.78%

2011-43

95

395

429

188

59

37

1109

37514

2.96%

2011-44

98

398

525

191

66

29

1209

38431

3.15%

2011-45

96

437

553

189

67

35

1281

38838

3.30%

2011-46

94

372

471

181

46

35

1105

36696

3.01%

2011-47

89

429

309

153

36

27

954

27258

3.50%

2011-48

92

504

438

199

75

34

1250

36252

3.45%

2011-49

92

306

540

219

43

24

1132

35119

3.22%

2011-50

87

395

605

218

67

27

1312

34133

3.84%

2011-51

80

408

555

293

85

42

1383

26344

5.25%

2011-52

80

398

372

341

89

51

1251

28940

4.32%

2011-01

89

499

523

309

80

55

1466

33532

4.37%

2011-02

88

576

772

366

99

57

1870

34602

5.40%

2011-03

91

680

1032

491

145

54

2402

39161

6.13%

2011-04

96

827

1441

678

162

64

3172

42635

7.44%

2011-05

94

613

1335

658

148

63

2817

33849

8.32%

2011-06

91

676

1469

884

196

55

3280

40351

8.13%

2011-07

87

738

2007

1138

328

84

4295

42872

10.02%

2011-08

89

777

1462

736

178

57

3210

39561

8.11%

2011-09

86

575

879

454

127

107

2142

38255

5.60%

2011-10

81

452

741

329

82

19

1623

34850

4.66%

2011-11

84

348

423

301

77

24

1173

31144

3.77%

2011-12

79

336

413

248

57

28

1082

34202

3.16%

2011-13

74

324

363

200

37

12

936

31210

3.00%

2011-14

71

268

342

137

52

15

814

31299

2.60%

2011-15

59

199

200

90

24

7

520

21298

2.44%

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

US Map

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 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.


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Last updated June 03, 2011