Download 2010-2011 DSHS Flu Report Week 51

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Home >
Infectious Disease Control >
2010-2011 DSHS Flu Report Week_51
2010-2011 DSHS Flu Report Week_51
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 51 in Texas:
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The influenza (flu) activity level (geographic spread of influenza) for Texas was
"regional" and the ILINet Activity Level Indicator was "low". 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/.
One hundred and six (16.6%) specimens tested by NREVSS laboratories in Texas were
positive for influenza. Two specimens were positive for influenza B by 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 baseline but above the regional baseline.
No influenza-associated pediatric deaths were reported.
No outbreaks or school closures were reported.
Reports from Health Service Regions
Reports were received from all Health Service Regions (HSRs) for week 51. HSRs 4/5N, 8, 9/10,
and 11 reported an increased level of flu activity compared to week 50. HSRs 1, 6/5S, and 7
reported the same level of flu activity compared to week 50. HSR 2/3 reported a decreased level
of flu activity compared to week 50. 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 51, seven hospital laboratories and public health agencies across Texas reported
conducting a total of 640 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). Eighty-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.
Testing Information
Week 51
No. of specimens tested
640
No. of positive
specimens (%)
106
(16.6%)
Positive specimens by type/subtype
Influenza A
Subtyping
performed
A (2009
H1N1)
A (other
H1N1)
A (H3N2)
91
(85.8%)
0 (0%)
0 (0%)
0 (0%)
0 (0%)
Subtyping not
performed
91 (100%)
Influenza B
15
(14.2%)
Additional influenza test results (rapid tests, culture, PCR) were reported from providers and
public health departments throughout the state (see county map at the end of this report).
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 51 are
summarized below.
Virus
Number of
Percentage
Laboratories
Tests
Positive of Tests
Testing
Performed Tests
Positive
Adenovirus
(respiratory)
3
133
5
3.76%
HMPV
2
67
2
2.99%
Parainfluenza
2
132
3
2.27%
Rhinovirus
1
54
22
40.74%
RSV
12
636
143
22.48%
Antigenic Characterization
Since July 2010, CDC has reported antigenic characterization results from 1 influenza A (H1N1)
virus, 7 influenza A (H3N2) viruses, and 7 influenza B viruses received from the Texas
Department of State Health Services (DSHS) Laboratory.
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Influenza A (H1N1) [1]
One virus was 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) [7]
Seven 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 [7]
o
o
Victoria lineage [7]
Seven 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.
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
Since July 2010, CDC has not reported any antiviral resistance testing results on influenza
isolates received from Texas laboratories.
Influenza–Associated Pediatric Mortality
No influenza-associated pediatric deaths were reported during week 51. One influenzaassociated pediatric fatality has been reported in Texas since the beginning of the 2010-2011
influenza season. Seven deaths have been reported during calendar year 2010. Please see the
table below for more information.
Influenza Type A
Month of
Total,
Total
Pediatric
All Influenza
Subtypes
Total
Influenza
death,
2009 Other
Not
Influenza A, Type B Types and
H3N2
2010
Subtypes
H1N1 H1N1
Subtyped All Subtypes
January
0
0
0
0
0
0
0
February
1
0
0
1
2
0
2
March
2
0
0
1
3
0
3
April
0
0
0
0
0
0
0
May
0
0
0
0
0
0
0
June
0
0
0
1
1
0
1
July
0
0
0
0
0
0
0
August
0
0
0
0
0
0
0
September 0
0
0
0
0
0
0
October
0
0
0
1
1
0
1
November 0
0
0
0
0
0
0
December 0
0
0
0
0
0
0
Unknown 0
0
0
0
0
0
0
Total
0
0
4
7
0
7
3
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 new influenza-associated deaths were reported in pregnant or postpartum women during
week 51.
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 school closures or institutional outbreaks were reported during week 51. 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-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 51. Of the 52 providers who saw patients, 38 (73%) saw at least one patient
with ILI. Of all patient visits during this week, 5.34% 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
12/30/2010 4:17:00 PM
#
Age Age
Week Reporting 0-4 5-24
Age
2549
Age
5064
Age 65
and
older
Total
ILI
Total
Patients % ILI
201140
94
373 370
208
54
26
1031
34136
3.02%
201141
93
384 367
193
53
19
1016
34623
2.93%
201142
94
358 426
202
36
22
1044
34735
3.01%
201143
92
376 412
188
59
37
1072
34048
3.15%
201144
95
388 499
190
66
29
1172
34705
3.38%
201145
92
411 504
188
67
35
1205
34980
3.44%
201146
90
350 424
178
46
35
1033
33352
3.10%
201147
85
393 275
151
36
27
882
25098
3.51%
201148
87
468 390
196
75
34
1163
32847
3.54%
201149
83
285 483
216
43
24
1051
30334
3.46%
201150
76
324 522
189
58
23
1116
28551
3.91%
201151
57
285 283
133
25
20
746
13965
5.34%
National Influenza Activity Map
The current U.S. flu weekly report (FluView) may be found at
http://www.cdc.gov/flu/weekly/fluactivity.htm.
*This map indicates geographic spread and does not measure the severity of influenza activity.
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;
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Last updated March 21, 2011
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