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2013 - 2014 Texas Influenza Surveillance Information

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INFLUENZA(2)

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2013 - 2014 Texas Influenza Surveillance Information Activity Report

Current Flu Activity Report in PDF Format

Please note: The 2013-2014 influenza season began on September 29, 2013. For reports from the 2012-2013 season, please see http://www.dshs.state.tx.us/idcu/disease/influenza/surveillance/2013/.  


During week 15 in Texas

Summary
Texas influenza laboratory data and influenza-like illness (ILI) indicators have demonstrated a consistent decrease for the last several weeks.

Texas Surveillance Component

Change from Previous Week

Current Week

Previous Week

Page of Report

Table 1: Summary of Texas Influenza (Flu) and Influenza-like Illness (ILI) Activity for the Current Week

Statewide influenza activity level reported to CDC (geographic spread of influenza)

No Change

Local

Local

--

Statewide ILINet Activity Indicator assigned by CDC (intensity of influenza-like illness)

1

6-Moderate

5-Low

--

Percentage of specimens positive for influenza

▼3.02%

10.73%

13.75%

1

Percentage of visits due to ILI (ILINet)

 0.27%

4.84%

5.11%

3

Number of regions reporting increased flu/ILI activity

▲2

2

0

5

Number of regions reporting decreased flu/ILI activity

▼4

2

6

5

Number of variant/novel influenza infections

No Change

0

0

5

Number of ILI/influenza outbreaks

No Change

0

0

5

Number of pediatric influenza deaths

 No New Cases Reported

0

1

5

Data displayed have been updated since last week’s flu report with any new reports received.

Laboratory Results
Influenza
Hospital laboratories across Texas voluntarily report influenza tests (antigen, culture, and PCR) to the National Respiratory and Enteric Virus Surveillance System (NREVSS). Providers throughout Texas also submit specimens for influenza testing (PCR) to Texas public health laboratories, including the Texas Department of State Health Services (DSHS) state laboratory in Austin and the nine additional Texas Laboratory Response Network (LRN) laboratories. The results reported by Texas NREVSS participants and public health laboratories for the current week are summarized in the table below. Additional influenza test results (rapid tests, culture, PCR) and ILI activity were reported from providers and public health departments throughout the state (see county map at the end of this report).

 

Week 15

Table 2: Influenza Testing Performed by Texas Laboratories for the Current Week

Number of labs reporting flu tests

11

Number of specimens tested

979

Number of positive specimens (%)

105 (10.73%)

Percentage of total tests that were antigen detection tests

59.24%

Positive specimens by type/subtype [n (%)]

Influenza A

13 (12.4%)

      Subtyping performed

6 (46.2%)

              A (H1N1)

0 (0.0%)

              A (H3N2)

6 (100%)

      Subtyping not performed

7 (53.8%)

Influenza B

92 (87.6%)

Laboratory data in 2013-2014 season reports may not be comparable to reports from previous seasons because of 
        the inclusion of DSHS and LRN laboratory data for the current season.


Figure 1: Number and Percentage of Tests (Antigen, Culture, PCR) Positive for Influenza by Type and Subtype Reported by Texas Laboratories, 2013–2014 Season.
Flu Percentage Subtype

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 for the current week are summarized below.

Virus

Number of Laboratories Testing

Tests Performed

Positive Tests

Percentage of Tests Positive

Table 3: Non-Influenza Respiratory Virus Testing
Performed by Texas NREVSS Laboratories for the Current Week

Adenovirus (respiratory

4

358

16

4.47%

HMPV

5

384

33

8.59%

Parainfluenza virus

5

486

30

6.17%

Rhinovirus

3

339

109

32.15%

RSV

9

479

19

3.97%

Some non-NREVSS reporters also contribute to the RSV data.


Antigenic Characterization
Since September 29, 2013, CDC has reported antigenic characterization results from 83 influenza A (H1N1) viruses, 18 influenza A (H3N2) viruses, and 17 influenza B viruses received from the Texas Department of State Health Services (DSHS) Laboratory. The DSHS Laboratory sends a representative sample of influenza viruses to the CDC throughout the flu season.

  • Influenza A (H1N1) [83]
    Eighty-three (100%) viruses were related to A/California/07/2009. This virus strain was included in the 2013-2014 influenza vaccine for the Northern Hemisphere
  • Influenza A (H3N2) [18]
    Eighteen viruses (100%) were related to A/Texas/50/2012, an A (H3N2) virus antigenically like the cell-propagated prototype virus A/Victoria/361/2011. This virus strain was included in the 2013-2014 influenza vaccine for the Northern Hemisphere.
  • Influenza B [17]
    • Yamagata lineage [6]: Six (35%) influenza B/Yamagata-lineage viruses have been characterized from Texas. B/ Massachusetts/2/2012-like is included as an influenza B component of the 2013-2014 Northern Hemisphere trivalent and quadrivalent influenza vaccines.
    • Victoria lineage [11]: Eleven (65%) influenza B/Victoria-lineage viruses have been characterized from Texas  B/Brisbane/60/2008-like, which is included as an influenza B component of the 2013-2014 Northern Hemisphere quadrivalent influenza vaccine.

Antiviral Resistance
Table 4 displays the number of influenza viruses from Texas that have been tested for antiviral resistance since October 1, 2013. Three 2009 influenza A (H1N1) viruses have tested positive for the mutation that confers resistance to oseltamivir.

Oseltamivir

Zanamivir

Table 4: Cumulative Antiviral Resistance Results from Texas Influenza Viruses, 2013-2014 Season†

Virus samples tested (n)

Resistant viruses, number (%)

Virus samples tested (n)

Resistant viruses, number (%)

Influenza A (H1N1)

354

3 (0.85%)

75

0 (0%)

Influenza A (H3N2)

15

0 (0%)

15

0 (0%)

Influenza B

5

0 (0%)

5

0 (0%)

This table includes specimens submitted as part of routine surveillance and not for diagnostic purposes.

U.S. Outpatient Influenza-like Illness Surveillance Network (ILINet)

 

Week 15

Table 5: Texas ILINet Reporting and Patient Visit Summary for the Current Week

Number of providers reporting

89

Number of providers reporting patient visits

88

Number (%) of providers with at least one ILI case

71 (80.7%)

Percentage of all visits due to ILI

4.84%

Texas ILINet baseline, 2013–2014

4.35%

Reporting providers include both ILINet and Enhanced ILINet/IISP providers.
The baseline is the mean percentage of patient visits for ILI during non-influenza weeks for the previous three seasons plus two standard deviations. A “non-influenza week” is defined as a week that accounted for less than 2% of the season’s total number of specimens that tested positive for influenza.

  Providers  Number of ILI Cases by Age Group (Years)  Total ILI    

 Week

Reporting 

0-4

5-24

25-49

50-64

65+

(all ages)  

Total Patients  

% ILI  

Table 6: Percentage of Visits for Influenza-like Illness Reported by Texas ILINet Participants (as of 4/17/2014 2:24 PM)
201340 124 244 424 279 129 129 1205 32650 3.69%
201341 129 308 452 295 127 116 1298 34475 3.77%
201342 126 306 434 321 137 100 1298 30976 4.19%
201343 127 305 481 325 110 111 1332 34658 3.84%
201344 127 338 426 285 149 136 1334 33751 3.95%
201345 128 323 516 316 147 104 1406 30801 4.56%
201346 128 352 642 491 174 141 1800 34893 5.16%
201347 124 405 761 558 197 114 2035 34921 5.83%
201348 125 328 465 535 162 95 1585 22865 6.93%
201349 121 372 790 798 198 57 2215 30736 7.21%
201350 120 383 983 812 216 67 2461 29791 8.26%
201351 117 627 1536 1491 401 92 4147 32803 12.64%
201352 123 547 1016 1288 474 200 3525 25638 13.75%
201401 126 532 837 1366 505 281 3521 29199 12.06%
201402 125 517 917 1142 442 299 3317 33700 9.84%
201403 123 405 898 854 274 173 2604 34395 7.57%
201404 118 336 704 673 256 193 2162 30363 7.12%
201405 122 365 743 623 216 162 2109 30991 6.81%
201406 120 312 633 565 198 155 1863 30698 6.07%
201407 119 267 739 531 215 152 1904 32715 5.82%
201408 120 304 709 559 211 145 1928 32378 5.95%
201409 109 282 586 444 115 58 1485 28959 5.13%
201410 115 272 593 523 199 144 1731 30098 5.75%
201411 112 214 391 464 196 138 1403 25772 5.44%
201412 111 233 492 474 203 127 1529 29390 5.20%
201413 107 214 494 437 174 127 1446 27474 5.26%
201414 103 205 474 393 180 119 1371 26804 5.11%
201415 89 156 504 317 76 37 1090 22510 4.84%


Figure 2: Percentage of Visits Due to Influenza-like Illness Reported by Texas ILINet Participants, 013–2014 Season
Ili Data Chart
Figure 3: Percentage of Visits Due to Influenza-like Illness Reported by Texas ILINet Participants, 2010–2014 Seasons
Ili Percentage Graph


Reports from Health Service Regions

Reports were received from all Health Service Regions (HSRs) during week 15. HSRs 1 and 9/10 reported an increased level of flu activity compared to week 14. HSRs 2/3 and 8 reported a decreased level of flu activity compared to week 14. The remaining HSRs reported the same level of flu activity compared to week 14. 

Variant Influenza Viruses
No variant or novel influenza viruses have been detected in Texas in 2013 or 2014.

Institutional Outbreaks and School Closures
No influenza or ILI outbreaks or school closures were reported during week 15.  

Influenza-Associated Pediatric Mortality  

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

Eighteen influenza-associated pediatric deaths have been reported in Texas during the 2013-2014 influenza season. Cases of influenza-associated pediatric mortality (children <18 years of age) are reportable year-round and by law in Texas.

Month of Pediatric Death

Influenza A (H1N1)

Influenza A (H3N2)

Influenza A (Not Subtyped)

Influenza B

Influenza, Not
Typed / Not
Differentiated

Influenza virus co-infection: A (not subtyped) and B

Total, All Influenza Types / Subtypes

Table 7: Influenza-Associated Pediatric Deaths Reported in Texas During the 2013–2014 Season
2013

October

0

0

0

0

0

0

0

November

0

0

0

0

0

0

0


December

3

0

2

0

0

0

5

2014

January

6

0

1

1

0

0

8


February

0

0

1

0

0

1

2


March

0

0

1

2

0

0

3


April

0

0

0

0

0

0

0

Total

9

0

5

3

0

1

18


Texas Flu Map

Please note:
The majority of influenza cases are not reportable by law in Texas. This map contains data from sentinel sites and only displays influenza and ILI cases that were reported to public health. Positive laboratory results are reported according to specimen collection date, or date received in the laboratory if the former is unknown.

Texas Influenza Surveillance Components and Measures
Activity codes    (see http://www.cdc.gov/flu/weekly/overview.htm)
Statewide influenza activity level
    A code reported weekly by states and territories to CDC indicating the geographic spread of influenza in the state. Levels are no activity, sporadic, local, regional, and widespread.

ILINet Activity Indicator
    A statewide level of influenza-like illness intensity assigned to each state weekly by CDC based on data reported through ILINet.


Morbidity
Novel/variant influenza
    Thorough investigations are performed on all cases of novel/variant influenza. This condition is reportable by law in Texas.

Texas ILINet
    Providers voluntarily report weekly to CDC’s ILINet system on the number of outpatient visits for ILI and total outpatient visits. Providers may submit up to 5 specimens per month for influenza testing. See http://www.dshs.state.tx.us/idcu/disease/influenza/surveillance/ILINet/ for information on how to become an ILINet provider.

Enhanced ILINet/IISP
    Providers report weekly to ILINet and submit specimens on the first 10 patients seen with ILI each week. Specimens are tested for a variety of respiratory viruses.

ILI activity
    Non-ILINet providers report ILI or influenza data weekly to local or regional health departments.

Outbreaks
    Healthcare and childcare facilities report ILI and influenza outbreaks to health departments in Texas. This condition is reportable by law in Texas.


Mortality 
    
Influenza-associated pediatric deaths 
        Deaths that are associated with influenza in children < 18 years of age are reported to health departments in Texas. This condition is reportable by law in Texas. http://www.dshs.state.tx.us/idcu/disease/IAPM/


Laboratory 
        
DSHS Austin laboratory 
            Providers voluntarily submit specimens to the DSHS Austin laboratory for influenza PCR testing throughout the season. 
            Providers sign up for this program through their local health departments. 
        Laboratory Response Network (LRN) laboratories
            Providers voluntarily submit specimens to one of the 9 Texas LRNs for influenza PCR testing throughout the season. 
            Providers sign up for this program through their local health departments. 
        NREVSS 
            Laboratories voluntarily report influenza and other respiratory virus data weekly through the CDC’s online NREVSS reporting system. 
            Laboratories sign up for this program by contacting DSHS. http://www.cdc.gov/surveillance/nrevss/


Recommended Resources
Texas Department of State Health Services 
    
DSHS influenza page: http://www.texasflu.org/  
    
Influenza surveillance data and reports: http://www.dshs.state.tx.us/idcu/disease/influenza/surveillance/
    
Map of Texas Health Service Regions: http://www.dshs.state.tx.us/regions/state.shtm

Centers for Disease Control and Prevention
    
National FluView weekly flu report: http://www.cdc.gov/flu/weekly/
    
Variant and novel influenza viruses: http://www.cdc.gov/flu/avianflu/index.htm; http://www.cdc.gov/flu/swineflu/index.htm
    
Infection Control in Healthcare Facilities: http://www.cdc.gov/flu/professionals/infectioncontrol/
    
Seasonal Flu Information for Schools and Childcare Providers: http://www.cdc.gov/flu/school/index.htm

World Health Organization 
    
Influenza page: http://www.who.int/topics/influenza/en/  
    
Disease Outbreak News: http://www.who.int/csr/don/en/

2013 - 201 Texas Influenza Surveillance Information --- Flu Reports

For the week ending: 10/05/13; 10/12/13; 10/19/13; 10/26/13; 11/2/13; 11/9/13; 11/16/13; 11/23/13; 11/30/13; 12/7/13; 12/14/13; 12/21/13; 12/28/13; 1/4/14; 1/11/14; 1/18/14; 1/25/14; 2/1/14; 2/8/14; 2/15/14; 2/22/14; 3/1/14; 3/8/14; 3/15/14; 3/22/14; 3/29/14; 4/5/14; 4/12/14

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Last updated April 22, 2014