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    Infectious Disease Prevention Section
    Mail Code: 1927
    PO BOX 149347 - Austin, TX 78714-9347
    1100 West 49th Street, Suite G401
    Austin, TX 78714

    Phone: (512) 776-7676
    Fax: (512) 776-7616


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week 21

Surveillance

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Influenza Influenza
(Flu)
ICD-9 487; ICD-10 J10,11
Related Topics: Protecting Yourself During the Cold and Flu Season, Avian Flu, Vaccine Preventable Diseases, Asthma and SARS
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2008 - 2009 Texas Influenza Surveillance Information

Current Flu Activity Report in PDF Format

Influenza Surveillance Report for MMWR Week 21

The influenza (flu) activity level for Texas for the week ending May 30, 2009 was “regional.” During week 21, 95 (8.2%) 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 regional baseline.

 

Reports from Health Service Regions

Reports were received from all Health Service Regions (HSRs) for week 21. HSRs 1, 7, and 8 reported the same level of flu activity compared to week 20. All other HSRs reported a decreased level of flu activity compared to week 20. For a map of Health Service Regions, please visit the following website: http://www.dshs.state.tx.us/regions/state.shtm

 

Laboratory Results

During week 21, 12 hospital laboratories and public health agencies across Texas reported conducting a total of 1,157 influenza tests (antigen, culture, and PCR) to the National Respiratory and Enteric Virus Surveillance System (NREVSSnew window) sponsored by the Centers for Disease Control and Prevention (CDC). Of the 1,029 antigen detection tests that were performed, 85 were positive for influenza A/not subtyped and 1 was positive for influenza B. The positive results were reported from Bexar, Collin, Dallas, Harris, Nueces, and Tarrant counties.

A total of 35 reports of PCR- or culture-confirmed seasonal influenza were received from public health laboratories, Texas Children's Hospital in Houston, NREVSS, and other sources for the following counties during week 21 (May 24-May 30):

 

Influenza A/H1 (seasonal) Influenza A/H3 Influenza A/not subtyped Influenza B
(none) Brazos County Dallas County (2) (none)
  Hidalgo County El Paso County  
  Travis County Harris County (28)  
    Maverick County  
  Isolates Tested (n) Resistant Viruses,
Number (%) 		Isolates Tested (n) Resistant Viruses,
Number (%)
Oseltamivir Zanamivir Adamantanes
Influenza A/H1 22 22 (100%) 0 (0) 22 0 (0)
Influenza A/H3 7 0 (0) 0 (0) 7 7 (100%)
Influenza B 22 0 (0) 0 (0) N/A* N/A*
                                     *Adamantanes are not effective against influenza B viruses.

CDC has issued interim recommendations for use of antiviral medications in the 2008-09 influenza season. Those recommendations are available at: http://www.cdc.gov/flu/professionals/antivirals/index.htm..

 

Influenza–Associated Pediatric Mortality

One influenza-associated pediatric fatality in a Texas resident occurred during week 21. The death occurred in a 12-year-old resident of Health Service Region 6 with significant underlying medical conditions. A specimen obtained from the child was positive for novel influenza A H1N1 by PCR and viral culture. The child was vaccinated for influenza for the current season. Texas has reported twelve influenza-associated pediatric fatalities during the 2008-09 influenza season.

 

School Closures and Institutional Outbreaks

No new school closures were reported for week 21. For more information on school closures, please see http://ritter.tea.state.tx.us/swineflu/schclosings.html.

 

U.S. Outpatient Influenza-like Illness Surveillance Network

Fifty-seven 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 21. Of the 54 providers who reported seeing patients during week 21, 21 (39%) providers saw at least one patient with ILI. Of all patient visits during this week, 1.25% were due to ILI. The ILI baseline for HHS Region 6 (Arkansas, Louisiana, New Mexico, Oklahoma, and Texas) of the United States is 4.6% for the 2008-2009 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.
Percentage of Visits for Influenza–Like Illness Reported by the US Outpatient Influenza–Like Illness Surveillance Network (ILINet) in Texas as of 6/12/2009 3:18:50 PM
Week # Reporting Age 0-4 Age 5-24 Age 25-64 Age over 64 Total ILI Total Patients % ILI
2008-40 78 84 133 127 22 366 20333 1.80
2008-41 78 114 163 124 19 420 20105 2.09
2008-42 79 107 156 90 7 360 19746 1.82
2008-43 80 120 152 106 20 398 19857 2.00
2008-44 82 136 199 104 26 465 20972 2.22
2008-45 79 110 111 122 27 370 20959 1.77
2008-46 74 110 107 103 23 343 19890 1.72
2008-47 76 137 143 122 19 421 19907 2.11
2008-48 80 132 132 125 37 426 17012 2.50
2008-49 78 143 159 153 24 479 20446 2.34
2008-50 76 133 146 108 28 415 19450 2.13
2008-51 70 172 177 175 24 548 17663 3.10
2008-52 77 194 153 154 34 535 13509 3.96
2008-53 78 176 141 165 46 528 15329 3.44
2009-01 79 162 182 188 38 570 18646 3.06
2009-02 78 178 287 235 41 741 20222 3.66
2009-03 79 174 468 341 43 1026 23058 4.45
2009-04 79 260 679 333 47 1319 24350 5.42
2009-05 74 282 884 467 40 1673 24734 6.76
2009-06 80 301 965 392 59 1717 24320 7.06
2009-07 80 320 816 316 57 1509 26024 5.80
2009-08 74 221 552 283 57 1113 24664 4.51
2009-09 77 194 423 245 71 933 22428 4.16
2009-10 80 221 325 212 77 835 22635 3.69
2009-11 77 167 269 178 58 672 19656 3.42
2009-12 72 109 150 179 18 456 20910 2.18
2009-13 73 114 143 163 16 436 18660 2.34
2009-14 80 158 197 234 51 640 20843 3.07
2009-15 77 92 136 156 23 407 21124 1.93
2009-16 85 131 197 163 28 519 21938 2.37
2009-17 77 260 570 348 44 1222 25406 4.81
2009-18 71 200 361 185 31 777 22382 3.47
2009-19 63 125 253 183 24 585 18858 3.10
2009-20 61 122 256 134 7 519 18942 2.74
2009-21 57 112 232 109 31 484 38574 1.25


ILI Percentage in Texas Chart

 

National Influenza Activity Map

The current U.S. flu weekly report 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.

For more information on flu surveillance activities in the State of Texas, please visit our main surveillance page.



*Influenza activity level corresponds to current MMWR week only and does not reflect previous weeks' activity. **Positives are reported according to specimen collection date or date received in the lab, if the former is unknown

Texas Department of State Health Services - Infectious Disease Control Unit
1100 West 49th Street, Suite T801, Mail Code: 1960 PO BOX 149347 - Austin, TX 78714-9347
(512) 458-7676 - Fax: (512) 458-7616 -

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Last updated January 21, 2011