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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
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Week 6

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Surveillance Reports

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2006-2007 Texas Influenza Surveillance Information

2006-2007 Season Summary

Influenza Surveillance Report for MMWR Week 6

The flu activity level for the week ending February 10, 2007 is widespread. This is the third consecutive week of the season that widespread activity has been reported. Widespread activity indicates that at least half of the regions are experiencing an increase in ILI and lab-confirmed (by culture) flu has been identified in those regions.

The DSHS laboratory isolated influenza A/H1 in specimens collected during week 6 from Childress, Dallas, Deaf Smith, Jefferson, Nueces, Starr, Tarrant, and Wichita Counties. Influenza A/H3 was isolated in one specimen from Travis County. Influenza B/Malaysia/2506/2004-like was isolated in specimens from Bexar, Dallas, and Smith Counties. Scott and White Laboratory reported culture confirmed influenza A from Bell, Brazos, Burleson, Falls, Grimes, Hill, McLennan, and Milam Counties and culture confirmed influenza B from Bell, Brazos, and McLennan Counties. The Air Force Institute for Operational Health (AFIOH) reported culture confirmed flu at Lackland and Sheppard Air Force Bases during week 6.

Three influenza-associated pediatric deaths have been reported in Texas since the beginning of 2007. The children were ages 4, 11, and 16. None had significant underlying illness prior to onset. Two had not been vaccinated with the current season’s vaccine. Vaccine status of the other case is unknown. All cases were confirmed by rapid test and identified as influenza A. One of the cases also had a positive RT-PCR, which indicated influenza A/H1. Another was confirmed as influenza A by culture. Any isolates will be sent to CDC for further testing. Since October 1, 2006, CDC has received 13 reports of influenza-associated pediatric deaths, three of which were reported during week 6.

Influenza A/H1 continues to be the predominant flu virus circulating in Texas and preliminary data indicates that the 2006-2007 vaccine is well matched. Physicians are urged to continue vaccinating for the flu, especially in children aged 6-59 months, pregnant women, individuals aged > 50, individuals with certain chronic conditions, caretakers of high-risk individuals, and healthcare workers. While not a substitute for vaccination, the antiviral agents, oseltamivir and zanamivir, should be used to treat or prevent flu whenever appropriate.

Several school closures due to influenza were reported during week 6. Schools in Henderson and Van Zandt Counties as well as one school in the Dallas area were closed for up to 2 days due to high absenteeism rates most likely associated with flu. Schools in Brown, Denton, Fisher, Johnson, Parker, and Young Counties have also reported high absenteeism rates; however, no school closures were reported in those counties.

Chart

Sixty-two sentinel providers reported influenza-like illness (ILI) for week 6. Of all patient visits during this week, 7.05% were due to ILI. This is the highest of the season to date. The baseline for Texas is 3.71%. 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 Influenza-Like Illness (ILI) Reported by Sentinel Providers in Texas
Week
# Reporting
Age 0-4
Age 5-24
Age 25-64
Age over 64
Total ILI
Total Patients
% ILI
2006-40
61
71
120
65
9
265
15479
1.71
2006-41
59
104
126
93
14
337
16457
2.04
2006-42
77
250
187
154
44
635
25223
2.51
2006-43
77
219
188
153
20
580
23296
2.48
2006-44
72
235
254
164
39
692
22504
3.07
2006-45
71
356
249
182
42
829
22660
3.65
2006-46
71
495
312
228
62
1097
24033
4.56
2006-47
76
450
277
237
95
1009
19958
5.05
2006-48
78
442
275
302
70
1089
24495
4.44
2006-49
84
374
325
283
96
1078
24229
4.44
2006-50
72
387
381
252
80
1100
22227
4.94
2006-51
67
349
259
187
50
845
17402
4.85
2006-52
63
460
199
264
104
1027
16039
6.40
2007-01
86
343
219
284
84
930
20681
4.49
2007-02
70
329
244
284
84
941
21612
4.35
2007-03
69
242
223
127
19
611
15135
4.03
2007-04
79
518
475
283
106
1382
24502
5.64
2007-05
81
557
575
375
62
1569
25569
6.13
2007-06
62
445
648
385
39
1517
21504
7.05
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Percentage of Visits Due to Influenza-Like Illness,
Texas Sentinel Providers Surveillance Network, 2006-2007 Season

Chart

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Statewide Influenza Activity For the Week Ending February 10, 2007 (MMWR Week 6)

Influenza in Texas Map

activitylevellegend                              Activity Level Legend 2

*Influenza activity level corresponds to current MMWR week only and does not reflect previous weeks’ activity.

2006-2007 Texas Influenza Surveillance Information - Flu Reports

For the week ending:
10/07/06, 10/14/06, 10/21/06, 10/28/06, 11/04/06, 11/11/06, 11/18/06, 12/02/06, 12/09/06, 12/16/06, 12/23/06, 12/30/06
01/06/07, 01/13/07, 01/20/07, 01/27/07, 02/17/07, 02/24/07, 03/03/07, 03/10/07, 03/17/07, 03/24/07, 03/31/07, 04/07/07,
04/14/07, 05/05/07

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Last updated October 18, 2021