Download 2010-2011 DSHS Flu Report Week 15

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Home >
Infectious Disease Control >
2010-2011 DSHS Flu Report Week 15
2010-2011 DSHS Flu Report Week 15
2010 - 2011 Texas Influenza Surveillance Information
Current Flu Activity Report in PDF Format
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 15 in Texas:
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The influenza (flu) activity level (geographic spread of influenza) for Texas was
“sporadic” and the ILINet Activity Level Indicator (intensity of influenza-like illness)
was “minimal”. 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/.
Twelve (3.5%) specimens tested by NREVSS laboratories in Texas were positive for
influenza. One specimen was positive for 2009 influenza A (H1N1) and one specimen
was 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 was below the state and HHS regional baselines.
No influenza-associated pediatric deaths were reported.
No institutional outbreaks or school closures were reported.
Reports from Health Service Regions
Reports were received from all Health Service Regions (HSRs) for week 15. HSR 6/5S reported
the same level of flu activity compared to week 14. All other HSRs reported a decreased level of
flu activity compared to week 14. 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 15, seven hospital laboratories and public health agencies across Texas reported
conducting a total of 340 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). Fifty-six 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.
Influenza Testing Results Reported by Texas NREVSS
Laboratories
Testing Information
Week 15
No. of specimens tested
340
No. of positive specimens (%)
12 (3.5%)
Positive specimens by type/subtype
Influenza A
10 (83.3%)
Subtyping performed
1 (10%)
A (2009 H1N1)
1 (100%)
A (Seasonal H1)
0 (0%)
A (H3N2)
0 (0%)
Subtyping not performed
9 (90%)
Influenza B
2 (16.7%)
Additional influenza test results (rapid tests, culture, PCR) were reported from providers and
public health departments throughout the state (see county map below).
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 15 are
summarized below.
Other Respiratory Virus Results Reported by Texas NREVSS Laboratories
Virus
Number of
Percentage
Tests Positive
Laboratories
of Tests
Performed Tests
Testing
Positive
Adenovirus (respiratory)
HMPV
Parainfluenza
Rhinovirus
RSV
Antigenic Characterization
3
3
4
2
14
146
120
147
110
382
3
8
13
41
23
2.05%
6.67%
8.84%
37.27%
6.02%
Since October 3, 2010, CDC has reported antigenic characterization results from 12 influenza A
(H1N1) viruses, 30 influenza A (H3N2) viruses, and 14 influenza B viruses received from the
Texas Department of State Health Services (DSHS) Laboratory.
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Influenza A (H1N1) [12]
Twelve 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) [30]
Thirty 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 [14]
o Victoria lineage [14]
Fourteen 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.
o 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 15. Twelve influenzaassociated pediatric fatalities have been reported in Texas since the beginning of the 2010-2011
influenza season. Eleven deaths have been reported during calendar year 2011. Please see the
table below for more information
Influenza-Associated Pediatric Deaths in Texas Residents by Type, Subtype, and Month
Influenza Type A
Total,
Month of
Total
All Influenza
Subtypes
Total
Pediatric
Influenza
Influenza A, Type B Types and
2009
Other
Not
Death
H3N2
Subtypes
H1N1
H1N1
Subtyped All Subtypes
2010
0
0
1
1
0
1
October 0
Influenza-Associated Pediatric Deaths in Texas Residents by Type, Subtype, and Month
Influenza Type A
Total,
Month of
Total
All
Influenza
Subtypes
Total
Pediatric
Influenza
Influenza
A, Type B Types and
2009
Other
Not
Death
H3N2
Subtypes
H1N1
H1N1
Subtyped All Subtypes
0
0
0
0
0
0
November 0
0
0
0
0
0
0
December 0
2011
0
1
1
2
1
3
January 0
0
1
2
5
0
5
February 2
0
0
1
2
1
3
March 1
Total 3
0
2
5
10
2
12
Cases of influenza-associated pediatric mortality (children <18 years of age) are reportable yearround 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 influenza-associated deaths were reported in pregnant or postpartum women during week 15.
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
No institutional outbreaks or school closures were reported during week 15. 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
Fifty-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 15. Of the 58 providers who saw patients, 30 (52%) saw at least one patient
with ILI. Of all patient visits during this week, 2.44% 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
(4/25/2011 7:39:00 AM)
Week # Reporting
2011-40
2011-41
2011-42
2011-43
2011-44
2011-45
2011-46
2011-47
2011-48
2011-49
2011-50
2011-51
2011-52
2011-01
2011-02
2011-03
2011-04
2011-05
2011-06
2011-07
2011-08
2011-09
2011-10
2011-11
2011-12
2011-13
2011-14
2011-15
97
96
97
95
98
96
94
89
92
92
87
80
80
89
88
91
96
94
91
87
89
86
81
84
79
74
71
59
Age Age Age Age
Age 65 Total Total
% ILI
0-4 5-24 25-49 50-64 and older ILI Patients
375 375
400 389
374 443
395 429
398 525
437 553
372 471
429 309
504 438
306 540
395 605
408 555
398 372
499 523
576 772
680 1032
827 1441
613 1335
676 1469
738 2007
777 1462
575 879
452 741
348 423
336 413
324 363
268 342
199 200
209
193
202
188
191
189
181
153
199
219
218
293
341
309
366
491
678
658
884
1138
736
454
329
301
248
200
137
90
55
53
36
59
66
67
46
36
75
43
67
85
89
80
99
145
162
148
196
328
178
127
82
77
57
37
52
24
27
19
22
37
29
35
35
27
34
24
27
42
51
55
57
54
64
63
55
84
57
107
19
24
28
12
15
7
1041
1054
1077
1109
1209
1281
1105
954
1250
1132
1312
1383
1251
1466
1870
2402
3172
2817
3280
4295
3210
2142
1623
1173
1082
936
814
520
37881 2.75%
37677 2.80%
38758 2.78%
37514 2.96%
38431 3.15%
38838 3.30%
36696 3.01%
27258 3.50%
36252 3.45%
35119 3.22%
34133 3.84%
26344 5.25%
28940 4.32%
33532 4.37%
34602 5.40%
39161 6.13%
42635 7.44%
33849 8.32%
40351 8.13%
42872 10.02%
39561 8.11%
38255 5.60%
34850 4.66%
31144 3.77%
34202 3.16%
31210 3.00%
31299 2.60%
21298 2.44%
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.
1
Influenza activity level corresponds to current MMWR week only and does not
reflect previous weeks' activity.
2
The majority of influenza cases are not reportable by law to the Texas
Department of State Health Services. This map contains data from sentinel sites
and does not represent all influenza cases in the state.
3
Positive laboratory results are reported according to specimen collection date or
date received in the lab if the former is unknown.
2010 - 2011 Texas Influenza Surveillance Information --- Flu Reports
For the week ending: 10/09/10; 10/16/10; 10/23/10; 10/30/10; 11/06/10; 11/13/10; 11/20/10;
11/27/10; 12/04/10; 12/11/10; 12/18/10; 12/25/10; 01/01/11; 01/08/11; 01/15/11; 01/22/11;
01/29/11; 02/05/11; 02/12/11; 02/19/11; 02/26/11; 03/05/11; 03/12/11;
03/19/11; 03/26/11; 04/02/11; 04/09/11; 04/16/11;
Return to the Top of the Page
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Last updated June 3, 2011
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