Antiviral Guidance
Conferences
FAQs
Resources
Vaccine
Related Topics:
Asthma
Avian Flu
Cold-Flu Prevention
SARS
Vaccine Preventable Diseases
2010-2011
2009-2010
2008-2009
2006-2007
2005-2006
2004-2005
2003-2004
2002-2003
2001-2002
2000-2001
1999-2000
1998-1999
ILINet
Influenza Surveillance Report for MMWR Week 8
The influenza (flu) activity level for Texas for the week ending February 23, 2008 is “widespread.” Widespread activity indicates that at least half of the regions in the state are experiencing an increase in influenza–like illness (ILI) and have recent culture–confirmed influenza.
Reports were received from all 11 Health Service Regions (HSRs) for week 8. HSR 2/3 reported an increase in flu activity compared to week 7. HSRs 4/5N, 6/5S, and 9/10 reported the same level of flu activity as the previous week. HSRs 1, 7, 8, and 11 reported a decrease in flu activity compared to the previous week. Flu activity in Texas remains widespread overall, but activity continues to decrease slightly in some regions. For a map of Health Service Regions, please visit the following website:
Texas Health Service Regions Map
Laboratory Results
During week 8, seven hospital laboratories and public health agencies across Texas reported conducting a total of 911 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). Of the 832 antigen detection tests performed, 108 were positive for influenza A/not subtyped and 94 were positive for influenza B. These results were reported from Bell, Bexar, Dallas, Harris, Nueces, and Webb counties. Of the 47 PCR tests performed, 5 were positive for influenza A/H3, 11 were positive influenza A/not subtyped, and 8 were positive for influenza B. These results were reported from Bell, Brazos, Hill, Tarrant, Travis, and Williamson counties. A total of 128 reports of culture-confirmed influenza were received from the Texas Department of State Health Services (DSHS) Laboratory, Scott and White Hospital Laboratory, Texas Children’s Hospital Laboratory, and other sources for the following counties:
Influenza A/H1 | Influenza A/H3 | Influenza A/not subtyped | Influenza B |
|
Duval County |
Bell County (16) |
Bell County (14) |
|
Jim Wells County |
Bexar County (5) |
Bexar County (20) |
|
Starr County (2) |
Brazos County (5) |
Dallas County (2) |
|
Travis County (2) |
Coryell County |
Falls County |
|
|
Dallas County (6) |
Harris County (8) |
|
|
Hill County |
Jim Wells County |
|
|
McLennan County (13) |
McLennan County (2) |
|
|
Montgomery County |
Medina County |
|
|
Wichita County (16) |
Tarrant County (2) |
|
|
Williamson County |
Travis County (4) |
|
|
|
Wichita County (2) |
Additional positive results from point-of-care rapid flu tests were reported by providers throughout the state (see Texas map below).
Antigenic Characterization
CDC has reported antigenic characterization results from 34 influenza isolates [7 influenza A/H1, 24 influenza A/H3, and 3 influenza B viruses] received from the DSHS Laboratory since the beginning of the 2007–08 flu season.
Influenza A/H1 [7]
- Seven (100%) of the seven viruses were characterized as A/Solomon Islands/3/2006, the influenza A/H1 component of the 2007–08 influenza vaccine for the Northern Hemisphere.
Influenza A/H3 [24]
- Two (8%) of the 24 viruses were characterized as A/Wisconsin/67/2005–like, the influenza A/H3 component of the 2007–08 influenza vaccine for the Northern Hemisphere.
- Twenty–one (88%) of the 24 viruses were characterized as A/Brisbane/10/2007–like. A/Brisbane/10/2007 is a recent antigenic variant which evolved from A/Wisconsin/67/2005–like.
- One (4%) of the 24 viruses showed somewhat reduced titers with antisera produced against A/Wisconsin/67/2005 and A/Brisbane/10/2007.
Influenza B (B/Victoria/02/87 and B/Yamagata/16/88 lineages) [3]
Victoria lineage [0]
- The influenza B component for the 2007–08 influenza vaccine is a B/Malaysia/2506/2004–like virus, belonging to the B/Victoria lineage.
Yamagata lineage [3] - Three (100%) of the three viruses were identified as belonging to the B/Yamagata lineage of viruses.
These results are very similar to national antigenic characterization results. The national 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.
It is not too late to get a flu vaccine for the current season. Although this season‘s flu vaccine strains do not appear to be optimally matched to circulating strains, the flu vaccine may reduce the severity and duration of illness and the risk of serious complications and death due to influenza.
Influenza–Associated Pediatric Mortality
No influenza–associated pediatric fatalities occurred during MMWR week 8. As of week 8, Texas has reported five influenza–associated pediatric deaths in the 2007–08 influenza season.
School Closures and Institutional Outbreaks
One school district closed in Van Zandt County due to increased influenza–like illness in week 8. No institutional outbreaks were reported.
Sentinel Provider Surveillance Network
Seventy–five sentinel providers reported data to the U.S. Influenza Sentinel Provider Surveillance System (SPSN) on patients with influenza–like illness (ILI) and total patients seen for any reason during week 8; of those, 66 (88%) providers reported seeing at least one patient with ILI. Of all patient visits during this week, 7.64% were due to ILI. The ILI baseline for the West South Central Region (Arkansas, Louisiana, Oklahoma, and Texas) of the United States is 4.3% for the 2007-2008 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 Influenza–Like Illness (ILI) Reported by Sentinel Providers in Texas as of (3/1/2008 8:58:06 PM |
Week | # Reporting | Age 0-4 | Age 5-24 | Age 25-64 | Age over 64 | Total ILI | Total Patients | % ILI |
2007-40 |
84 |
256 |
163 |
151 |
49 |
619 |
21410 |
2.89 |
2007-41 |
88 |
264 |
255 |
207 |
58 |
784 |
25255 |
3.10 |
2007-42 |
86 |
274 |
270 |
261 |
50 |
855 |
25776 |
3.32 |
2007-43 |
85 |
368 |
290 |
208 |
47 |
913 |
26428 |
3.45 |
2007-44 |
95 |
391 |
276 |
206 |
55 |
928 |
28213 |
3.29 |
2007-45 |
87 |
411 |
314 |
243 |
39 |
1007 |
25665 |
3.92 |
2007-46 |
79 |
442 |
306 |
215 |
65 |
1028 |
24713 |
4.16 |
2007-47 |
91 |
478 |
317 |
272 |
73 |
1140 |
22748 |
5.01 |
2007-48 |
84 |
506 |
298 |
299 |
74 |
1177 |
26193 |
4.49 |
2007-49 |
84 |
233 |
290 |
162 |
16 |
700 |
20713 |
3.38 |
2007-50 |
80 |
256 |
265 |
128 |
16 |
665 |
18711 |
3.55 |
2007-51 |
68 |
169 |
197 |
186 |
26 |
578 |
15597 |
3.71 |
2007-52 |
77 |
176 |
201 |
191 |
22 |
590 |
12436 |
4.74 |
2008-01 |
90 |
217 |
302 |
332 |
29 |
880 |
16520 |
5.33 |
2008-02 |
97 |
373 |
500 |
630 |
117 |
1620 |
25891 |
6.26 |
2008-03 |
81 |
289 |
518 |
370 |
36 |
1213 |
21940 |
5.53 |
2008-04 |
87 |
369 |
886 |
650 |
54 |
1959 |
23306 |
8.41 |
2008-05 |
96 |
601 |
1208 |
954 |
158 |
2921 |
29106 |
10.04 |
2008-06 |
92 |
557 |
1122 |
948 |
112 |
2739 |
28738 |
9.53 |
2008-07 |
89 |
523 |
955 |
767 |
118 |
2363 |
26402 |
8.95 |
2008-08 |
75 |
353 |
682 |
635 |
77 |
1747 |
22864 |
7.64 |

National Influenza Activity Map
The map showing influenza activity in the United States for MMWR week 8:
For more information on flu surveillance activities in the State of Texas, please visit our main
surveillance page.
The current U.S. flu weekly report may be found here.
The map showing influenza activity in the State of
Texas for MMWR week 8:
*Influenza activity level corresponds to current MMWR week only and does not reflect previous weeks' activity.
2007-2008 Texas Influenza Surveillance Information - Flu Reports
For the week ending:
10/06/07,
10/13/07,
10/20/07,
10/27/07,
11/03/07,
11/10/07,
11/17/07,
11/24/07,
12/01/07,
12/08/07,
12/15/07,
12/22/07,
12/29/07,
01/05/08,
01/12/08,
01/19/08,
01/26/08,
02/02/08,
02/09/08,
02/16/08,
03/01/08,
03/08/08,
03/15/08,
03/22/08,
03/29/08,
04/05/08,
04/12/08,
04/19/08,
04/26/08,
05/03/08,
05/10/08,
05/17/08
Return to the Top of the Page