2009 - 2010 Texas Influenza Surveillance Information
Please note: Novel influenza A (H1N1)-specific surveillance activities were discontinued after the week ending May 22, 2010. Limited surveillance for all influenza types and subtypes will continue throughout the summer.During week 32 in Texas:
- No specimens tested by NREVSS laboratories in Texas were positive for influenza; however, the DSHS Austin Laboratory reported a PCR positive result for influenza A (H3N2) from a flu specimen submitted by a provider in Dallas County. The patient developed flu-like symptoms on the return flight from a 7-day trip to Honduras.
- 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 32. HSR 2/3 reported a decreased level of flu activity compared to week 31. HSRs 4/5N, 6/5S, 7, 8, 9/10, and 11 reported the same level of flu activity compared to week 31. HSR 1 did not determine a flu activity level for week 32 compared to week 31. For a map of Health Service Regions please visit the following website: www.dshs.state.tx.us/regions/state.shtm Laboratory Results
Influenza
During week 32, three hospital laboratories and public health agencies across Texas reported conducting a total of 87 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). Thirty-two 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 32 |
No. of specimens tested |
87 |
No. of positive specimens (%) |
0 (0%) |
Positive specimens by type/subtype |
Influenza A |
0 (0%) |
Subtyping performed |
0 (0%) |
A (novel H1N1) |
0 (0%) |
A (H3) |
0 (0%) |
A (Seasonal H1) |
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 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 32 are summarized below.
Virus |
Number of Laboratories Testing |
Tests Performed |
Positive Tests |
Percentage of Tests Positive |
Adenovirus (respiratory) |
2 |
79 |
4 |
5.06% |
HMPV |
2 |
42 |
0 |
0.00% |
Parainfluenza |
2 |
79 |
3 |
3.80% |
Rhinovirus |
2 |
42 |
7 |
16.67% |
RSV |
5 |
170 |
1 |
0.59% |
Novel Influenza A Virus Infections
Novel influenza A (H1N1)-specific surveillance was discontinued after May 22, 2010. For final novel influenza A (H1N1)-specific reports, please see the Texas Department of State Health Services (DSHS)novel influenza website (http://www.texasflu.org) and the CDC website (http://www.cdc.gov/h1n1flu/).
Antigenic Characterization
Since June 9, 2009, CDC has reported antigenic characterization results from 48 novel influenza A (H1N1) viruses, 1 seasonal influenza A (H1N1) virus, and 1 influenza B virus received from the Texas Department of State Health Services (DSHS) Laboratory.
Influenza Types/Subtypes |
Total number of Texas viruses characterized |
Do the viruses match the vaccine strains?
|
Yes |
No |
Novel influenza A (H1N1) |
48 |
48 (100%) |
0 |
Influenza A (H3N2) |
0 |
n/a |
n/a |
Influenza A (H1N1) (seasonal ) |
1 |
1 (100%) |
0 |
Influenza B |
1 |
1 (100%) |
0 |
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
Since June 9, 2009, CDC has reported antiviral resistance testing results on 110 novel influenza A (H1N1) isolates received from multiple Texas laboratories since April 26, 2009.
Flu Types/Subtypes |
Isolates Tested (n) |
Resistant Viruses, Number (%)
|
Isolates Tested (n) |
Resistant Viruses, Number (%)
|
Oseltamivir |
Zanamivir |
Adamantanes |
Influenza A (H1N1) (novel) |
111 |
3 (3%) |
0 (0) |
42 |
42 (100%) |
Influenza A (H3N2) |
0 |
0 (0) |
0 (0) |
0 |
0 (0) |
Influenza A (H1N1) (seasonal |
0 |
0 (0) |
0 (0) |
0 |
0 (00) |
Influenza B |
0 |
0 (0) |
0 (0) |
N/A* |
N/A* |
*Adamantanes are not effective against influenza B viruses.
Influenza–Associated Pediatric Mortality
No new influenza-associated pediatric fatalities were reported during week 32. There have been 33 influenza-associated pediatric fatalities reported in Texas since the beginning of the 2009-2010 influenza season, including 6 deaths during calendar year 2010. School Closures and Institutional Outbreaks
No institutional outbreaks or school closures were reported during week 32. CDC released new guidance for summer camps on May 17, 2010. This can be found at http://www.cdc.gov/h1n1flu/camp.htm. DSHS has issued guidance for cases of ILI and novel influenza A (H1N1) in summer camps, schools, and congregate facilities. Please see www.texasflu.org for more information. U.S. Outpatient Influenza-like Illness Surveillance Network
Thirty-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 32. Of the 29 providers who saw patients, 10 (34%) saw at least one patient with ILI. Of all patient visits during this week, 0.80% 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 2009-2010 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 08/19/2010 11:06:00 AM |
Week |
# Reporting |
Age 0-4 |
Age 5-24 |
Age 25-49 |
Age 50-64 |
Age 65 and older |
Total ILI |
Total Patients |
% ILI |
2009-40 |
101 |
1411 |
2402 |
510 |
178 |
64 |
4565 |
34309 |
13.31% |
2009-41 |
101 |
1411 |
2130 |
403 |
123 |
42 |
4109 |
32059 |
12.82% |
2009-42 |
104 |
1343 |
1914 |
387 |
115 |
37 |
3796 |
33981 |
11.17% |
2009-43 |
99 |
1112 |
1243 |
309 |
83 |
40 |
2787 |
29700 |
9.38% |
2009-44 |
106 |
990 |
1384 |
344 |
72 |
24 |
2814 |
33139 |
8.49% |
2009-45 |
104 |
709 |
1024 |
234 |
82 |
37 |
2086 |
30325 |
6.88% |
2009-46 |
103 |
699 |
814 |
220 |
69 |
26 |
1828 |
29893 |
6.12% |
2009-47 |
111 |
575 |
520 |
112 |
48 |
23 |
1278 |
22441 |
5.69% |
2009-48 |
104 |
652 |
578 |
164 |
74 |
27 |
1495 |
27439 |
5.45% |
2009-49 |
103 |
609 |
503 |
176 |
68 |
30 |
1386 |
28110 |
4.93% |
2009-50 |
99 |
419 |
347 |
154 |
66 |
22 |
1008 |
25411 |
3.97% |
2009-51 |
97 |
376 |
277 |
91 |
29 |
22 |
795 |
15834 |
5.02% |
2009-52 |
94 |
393 |
286 |
155 |
50 |
28 |
912 |
23430 |
3.89% |
2010-01 |
99 |
323 |
305 |
146 |
53 |
16 |
843 |
28720 |
2.94% |
2010-02 |
101 |
535 |
430 |
157 |
77 |
23 |
1222 |
30883 |
3.96% |
2010-03 |
95 |
364 |
387 |
148 |
41 |
18 |
958 |
31327 |
3.06% |
2010-04 |
92 |
326 |
478 |
159 |
30 |
16 |
1009 |
30818 |
3.27% |
2010-05 |
88 |
351 |
452 |
163 |
39 |
13 |
1018 |
30686 |
3.32% |
2010-06 |
89 |
325 |
393 |
173 |
47 |
18 |
956 |
31178 |
3.07% |
2010-07 |
83 |
354 |
375 |
184 |
35 |
14 |
962 |
32800 |
2.93% |
2010-08 |
85 |
260 |
422 |
195 |
66 |
29 |
972 |
33040 |
2.94% |
2010-09 |
85 |
311 |
439 |
208 |
59 |
27 |
1044 |
32859 |
3.18% |
2010-10 |
83 |
439 |
423 |
181 |
64 |
20 |
1127 |
32771 |
3.44% |
2010-11 |
87 |
167 |
205 |
147 |
44 |
18 |
581 |
27731 |
2.10% |
2010-12 |
87 |
211 |
289 |
162 |
44 |
23 |
729 |
30838 |
2.36% |
2010-13 |
86 |
201 |
246 |
114 |
21 |
16 |
598 |
27047 |
2.21% |
2010-14 |
87 |
213 |
210 |
132 |
33 |
15 |
603 |
29600 |
2.04% |
2010-15 |
87 |
249 |
275 |
110 |
44 |
24 |
702 |
30726 |
2.28% |
2010-16 |
84 |
268 |
318 |
100 |
22 |
15 |
723 |
30865 |
2.34% |
2010-17 |
94 |
271 |
251 |
112 |
33 |
16 |
683 |
30981 |
2.20% |
2010-18 |
89 |
203 |
238 |
115 |
36 |
19 |
611 |
31089 |
1.97% |
2010-19 |
85 |
243 |
248 |
129 |
32 |
7 |
659 |
30074 |
2.19% |
2010-20 |
74 |
146 |
169 |
102 |
22 |
13 |
452 |
26540 |
1.70% |
2010-21 |
71 |
178 |
188 |
90 |
23 |
13 |
492 |
25147 |
1.96% |
2010-22 |
58 |
107 |
184 |
87 |
17 |
6 |
401 |
20352 |
1.97% |
2010-23 |
59 |
109 |
122 |
89 |
13 |
9 |
342 |
24039 |
1.42% |
2010-24 |
56 |
72 |
140 |
58 |
12 |
3 |
285 |
22719 |
1.25% |
2010-25 |
56 |
108 |
146 |
44 |
18 |
5 |
321 |
21587 |
1.49% |
2010-26 |
56 |
106 |
120 |
66 |
16 |
13 |
321 |
20257 |
1.58% |
2010-27 |
57 |
96 |
130 |
55 |
24 |
10 |
315 |
19985 |
1.58% |
2010-28 |
52 |
78 |
137 |
94 |
14 |
8 |
331 |
19372 |
1.71% |
2010-29 |
49 |
96 |
85 |
52 |
20 |
8 |
261 |
19516 |
1.34% |
2010-30 |
44 |
86 |
70 |
64 |
20 |
1 |
241 |
20209 |
1.19% |
2010-31 |
38 |
57 |
43 |
20 |
3 |
5 |
128 |
13064 |
0.98% |
2010-32 |
29 |
27 |
32 |
25 |
5 |
2 |
91 |
11330 |
0.80% |
National Influenza Activity Map
The national influenza reporting season ended after May 22, 2010 (2010 MMWR week 20). National influenza reporting will resume on October 3, 2010. Archives for the U.S. flu weekly report (FluView) may be found at http://www.cdc.gov/flu/weekly/fluactivity.htm. For more information on flu surveillance activities in the State of Texas, please visit the following website: www.dshs.state.tx.us/idcu/disease/influenza/surveillance/
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