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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 5

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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 5 in Texas:

  • The influenza (flu) activity level (geographic spread of influenza) for Texas was "widespread" and the ILINet Activity Level Indicator (intensity of influenza-like illness) 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/.
  • Four hundred eighty-one (28.5%) specimens tested by NREVSS laboratories in Texas were positive for influenza. Forty specimens were positive for 2009 influenza A (H1N1), 101 specimens were positive for influenza A (H3N2), 86 specimens were positive for influenza A (not subtyped), and 61 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.
  • No influenza-associated pediatric deaths were reported.
  • One influenza outbreak was reported in a long-term care facility. Two schools reported high absenteeism and one district closed.

Reports from Health Service Regions

Reports were received from all Health Service Regions (HSRs) for week 5. HSR 6/5S reported an increased level of flu activity compared to week 4. HSRs 1, 4/5N, 8, 9/10, and 11 reported the same level of flu activity compared to week 4. HSRs 2/3 and 7 reported a decreased level of flu activity compared to week 4. 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 4, seven hospital laboratories and public health agencies across Texas reported conducting a total of 1,982 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). Eighty 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.

 

Testing Information Week 5
No. of specimens tested 1,690
No. of positive specimens (%) 481 (28.5%)
Positive specimens by type/subtype
Influenza A 368 (76.5%)
          Subtyping performed 141 (38.3%)
                 A (2009 H1N1) 40 (28.4%)
                 A (other H1N1) 0 (0%)
                 A (H3N2) 101 (71.6%)
           Subtyping not performed 227 (61.7%)
Influenza B 113 (23.5%)

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).

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 5 are summarized below.

 

Virus Number of
Laboratories
Testing
Tests
Performed
Positive
Tests
Percentage
of Tests
Positive
Adenovirus (respiratory) 4 309 11 3.56%
HMPV 3 237 10 4.22%
Parainfluenza 4 308 4 1.30%
Rhinovirus 2 229 49 21.40%
RSV 19 1232 283 22.97%

Antigenic Characterization

Since July 2010, CDC has reported antigenic characterization results from 3 influenza A (H1N1) viruses, 17 influenza A (H3N2) viruses, and 9 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 [9]
    • Victoria lineage [9]
      Nine 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 5. Three influenza-associated pediatric fatalities have been reported in Texas since the beginning of the 2010-2011 influenza season. Two deaths have been reported during calendar year 2011. 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
2010
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 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 0 1 1 2
Total 3 0 1 4 8 1 9


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 new influenza-associated deaths were reported in pregnant or postpartum women during week 5.

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 influenza outbreak was reported in a long-term care facility in HSR 8 during week 5. Fifteen individuals reported influenza-like illness, and four tested positive for influenza A (not subtyped) by rapid test.

Two schools in HSR 4/5N reported high absenteeism during week 5. Both schools reported positive rapid influenza tests for influenza A (not subtyped) and B. One of the districts closed. 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

Seventy 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 5. Of the 69 providers who saw patients, 60 (87%) saw at least one patient with ILI. Of all patient visits during this week, 8.94% 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
2/10/2011 3:22:00 PM
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 95 400 388 193 53 19 1053 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 91 504 436 199 75 34 1248 35922 3.47%
2011-49 90 309 536 219 43 24 1131 34860 3.24%
2011-50 86 395 604 219 67 27 1312 33879 3.87%
2011-51 78 408 555 293 85 42 1383 26225 5.27%
2011-52 77 397 371 341 89 51 1249 28641 4.36%
2011-01 87 500 514 307 78 55 1454 33052 4.40%
2011-02 87 576 767 365 99 55 1862 33954 5.48%
2011-03 88 680 1028 491 143 54 2396 38057 6.30%
2011-04 83 637 1168 632 148 61 2646 39175 6.75%
2011-05 70 459 876 422 88 36 1880 21036 8.94%
ILI Percentage in Texas Chart
ILI Data in Texas 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

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
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Last updated April 08, 2011