2009 CDC Week 25 (6/21-6/27)
Please note that all data are preliminary and may change as
more reports are received.
Quick Notes:
-
During April 19 through July 1, the
Washington Department of Health received reports of 98
hospitalized and 4 deceased persons confirmed to be
infected with pandemic H1N1 influenza virus.
-
Regionally, the pandemic H1N1 virus
accounted for 99% of the influenza A-positive specimens
with subtyping results in week 25.
-
During CDC Week 25, the influenza
activity in Washington was classified as local.
-
Among sentinel providers in
Washington, the proportion of patient visits due to
influenza-like illness is higher than the Region 10
baseline for the 2008–2009 influenza season. This is the
first time in seven weeks that this has occurred.
-
The proportion of influenza-like
illness reported by Washington sentinel providers is
also higher than the proportion of influenza-like
illness reported in the region for the fourth straight
week.
Pandemic H1N1
Influenza Virus
Currently,
local health jurisdictions report hospitalized and fatal
cases of pandemic H1N1 influenza
to the Washington State
Department of Health (DOH). During April 19 through
July 1, 2009, DOH received reports of 98 hospitalized and 4
deceased persons confirmed to be infected with pandemic H1N1
influenza virus (see graph).
Novel Influenza H1N1- Deaths and
Hospitalizations in Washington State
Outpatient
Influenza-like Illness Surveillance Network (ILINet) Data
During CDC Week 25,
six sentinel providers in Washington reported data to
CDC. Of 1108 patient visits, 43 patients (3.9%) met the case
definition for influenza-like illness (ILI; defined as fever
> 100° F or 37.8° C [oral or equivalent] AND cough
and/or sore throat [in the absence of a known cause other
than influenza]). This is higher than last week when
Washington sentinel providers reported that 2.7% of patients
met the ILI case definition (see table and chart below).
This week, 40 of the 43 cases were persons less than
25-years-old.
Washington -
Sentinel Provider ILI Data
CDC
week |
Sentinels
Reporting |
Age
0-4 |
Age
5-24 |
Age
25-64 |
Age
64+ |
Total
ILI |
Total
Patients |
% ILI |
|
25 (2009) |
6 |
25 |
15 |
3 |
0 |
43 |
1108 |
3.9 |
For this reporting week, the proportion
of patients with ILI was higher for Washington than the
proportion for the Health and Human Services (HHS) Region 10
(Alaska, Idaho, Oregon, and Washington) which was 2.9% (see
table below).
HHS Region 10 -
Sentinel Provider ILI Data
CDC
week |
#
Reporting |
Age
0-4 |
Age
5-24 |
Age
25-64 |
Age
64+ |
Total
ILI |
Total
Patients |
% ILI |
| 25 (2009) |
18 |
51 |
39 |
15 |
3 |
108 |
3646 |
2.9 |
Laboratory Data
Two of the World Health Organization/National Respiratory
and Enteric Virus Surveillance System (WHO/NREVSS)
collaborating laboratories in Washington reported testing
178 specimens during CDC Week 25. Twenty-five (14%) were
positive for influenza A virus (4 pandemic H1N1; 20
unsubtyped; 1 unable to subtype). Through CDC Week 25, 1770
specimens tested by collaborating laboratories in Washington
have been positive for influenza. These data are in the
following table and figure.
Washington Influenza Isolates -
Cumulative
|
A(H1) |
A
(Pandemic
H1N1) |
A(H3) |
A
(Unsubtyped) |
A (Unable to
subtype) |
B
|
Total Influenza |
Total # Tested |
| 61 |
743 |
30 |
458 |
191 |
287 |
1770 |
11362 |
Of 631
specimens tested at five Region 10 WHO/NREVSS collaborating
laboratories during CDC Week 25, 161 (25.5%) were positive
for influenza A virus (132 pandemic H1N1; 1 seasonal H3; 20
unsubtyped; 8 unable to subtype). Below is the cumulative
number of influenza isolates for the 2008–09 influenza
season from HHS Region 10 reported by WHO/NREVSS. These data
are in the following table and figure.
HHS Region 10 Influenza Isolates -
Cumulative
|
A(H1) |
A (Pandemic H1N1) |
A(H3) |
A(Unsubtyped) |
A (unable
to subtype)
|
B
|
Total Influenza |
Total # Tested |
| 388 |
1275 |
313 |
466 |
203 |
691 |
3336 |
16863 |
Pneumonia and Influenza (P&I)
Mortality
Three cities in Washington take part in the 122-Cities
Mortality Reporting System; however, Washington data for CDC
Week 25 was not available when this report was compiled.
Nationally, of the 10163 deaths reported in week 25, 663
(6.5%) were due to pneumonia and influenza (P&I). This is
below the week 25 national epidemic threshold of 6.7%
Influenza-associated Pediatric
Mortality
Eight pediatric influenza-associated
deaths were reported to CDC this week (none from
Washington). Seven of these deaths were associated with
pandemic influenza A (H1N1) virus infection and one death
was due to infection with an unsubtyped influenza A virus.
Please remember that influenza-associated deaths in children
less than 18 years of age are reportable to your local
health jurisdiction as a Rare Disease of Public Health
Significance.
Notes
_________________________________________
This report was compiled by Natasha Close,
MPH, Tracy Sandifer, MPH, and Katelin Bugler, MPH, and
reviewed by Tony Marfin, MD, MPH.
Kathy Lofy, MD, medical
epidemiologist, is the new State Influenza Coordinator, assisted by Marisa D'Angeli, MD. Kathy can be reached at
kathy.lofy@doh.wa.gov
The Department of Health is always
looking for participation in influenza surveillance from
sentinel health care providers. If you are interested
in learning more about this program, please contact Kathy.
_________________________________________
DOH Flu News
CDC weekly Update
CDC Interim
Recommendations - Use of Antivirals
Oregon weekly Update
British
Columbia Update
EpiTrends September 2008 "Influenza Surveillance"
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