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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 44

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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 44 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/fluactivitysurv.htm and the national FluView weekly report at http://www.cdc.gov/flu/weekly/.
  • No specimens tested by NREVSS laboratories in Texas were positive for influenza.
  • 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 44. HSRs 2/3 and 8 reported an increased level of flu activity compared to week 43. All other HSRs reported the same level of flu activity compared to week 43.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 44, six 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 (NREVSS) sponsored by the Centers for Disease Control and Prevention (CDC). Forty-nine 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 44

No. of specimens tested 340
No. of positive specimens (%) 0 (0.0%)
Positive specimens by type/subtype
Influenza A 0 (0%)
          Subtyping performed 0(0%)

                A (2009 H1N1)

0 (0%)

                A (other H1N1)

0 (0%)
                A (H3N2) 0 (0%)
           Subtyping not performed 0 (0%)
Influenza B 0 (0%)

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 44 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

157

3

1.91%

HMPV

3

149

0

0.00%

Parainfluenza

3

153

9

5.88%

Rhinovirus

2

136

32

23.53%

RSV

16

226

9

3.98%

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 44.  No influenza-associated pediatric fatalities have been reported in Texas since the beginning of the 2011-2012 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
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

April

0

0

0

0

0

0

0

May

0

0

0

0

0

0

0

June

0

0

0

0

0

0

0

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

2

4

9

2

11

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 44. 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-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 44. Of the 49 providers who saw patients, 30 (61%) saw at least one patient with ILI. Of all patient visits during this week, 3.15% 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
11/10/2011 9:26:00 AM

 Week

#
Reports

Age
0-4

Age
5-24

Age
25-49

Age
50-64

Age
65 +

Total
ILI

Total
Patients

%
ILI

 2011-40

67

184 

291

199 

58

18

750

26506 

 2.83%

 2011-41

66

194

238

181

52

12

677

26576

2.55%

2011-42 66 196 292 194 62 19 763 24010 3.18%
2011-43 62 212 287 219 49 15 782 23888 3.27%
2011-44 49 176 277 179 55 12 699 22174 3.15%

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;

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Last updated February 10, 2012