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Swine-Origin Influenza A (H1N1) Virus or S-OIV
February 24, 2010
NOTICE: This will be the last Influenza Situation Report for the 2009-2010 Influenza Season unless the situation changes. |
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| Utah: Circulation: |
- The indicator used by public health to measure the circulation of influenza
in the community is influenza-like illness (ILI) as reported by sentinel
clinics. (An ILI sentinel clinic is a clinic that reports to public health the
percentage of patient visits seen for influenza-like illnesses).
- Influenza is currently circulating at a level that is typical for what is seen
during regular flu seasons. ILI activity reported in Utah this past reporting
week was 1.6%.
- This weeks’ ILI rate for Utah of 1.6% is up from the 1.0% from last week.
 This week’s ILI value is above the Utah ILI outbreak threshold of 1.1%
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| Severity: |
- The severity of an influenza outbreak (epidemic or pandemic) is measured
by the number of influenza infections that result in hospitalization or
death.
- Thus far for the 2009-2010 influenza season, the total number of
influenza infections and hospitalizations associated with influenza have
substantially exceeded the total expected for an entire influenza season.
- At this time there is no evidence that severity for the 2009 H1N1
Pandemic is changing, meaning that the ratio of infections resulting in
hospitalization or death has been relatively constant since the beginning
of the Pandemic.
- A total of 889 influenza-associated hospitalizations (IAHs) (due to both
seasonal and 2009 pandemic (H1N1) strains) have been reported to public
health this influenza season. There were two new IAH cases reported
within the last reporting week. These two cases occurred prior to this last
week but weren’t reported to public health until this past week.
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| 2009 Pandemic A (H1N1) deaths: |
- The severity measure listed above is for influenza caused by all strains
(regular seasonal flu and the 2009 Pandemic A (H1N1)). In addition, Utah
is collecting data on patient deaths (whether hospitalized or not) known to
have been related to the 2009 Pandemic A (H1N1) strain.
- A total of 28 deaths related to 2009 Pandemic A (H1N1) have been
reported to public health this influenza season. One new death was
reported to public health within the last reporting week.
- Deaths not previously reported:
1 in Tooele County – male between the age of 50-64 years (this
death occurred in November…the case was reported to public health
in November but was not identified as a fatal case until this past
week).
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| Circulating strains: |
- Laboratory data reported from 02/14/10 to 02/20/10 shows that 10 total
specimens were tested for influenza at the Unified State Laboratories:
Public Health (formerly the Utah Public Health Laboratory (UPHL)). Only
one of the ten specimens tested positive for influenza and it was positive
for 2009 Influenza A (H1N1).
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| National/international surveillance Summary: |
Note: Data in the National/International Surveillance Summary section of this report is from Sunday to Saturday (MMWR Week 06), February 7, 2010 to February 13, 2010.
National ILI levels were reported at 2.1%, this is below the national
baseline level of 2.3% for what is expected during this time of year.
During the past week, widespread influenza activity was reported in 0
states, with regional influenza activity being reported in three states, (see
map on next page).
Nationally, the proportion of deaths attributed to pneumonia and influenza
(P&I) during the past week was reported at 7.7%, which is below the
epidemic threshold for this time of year (7.8%). |
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Viral circulation and resistance:
Data in this section comes from the CDC and is collected nationally:
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3.5% (129 of 3,656) of all specimens tested for influenza were positive.
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96.9% (125 of 129) of all influenza isolates typed at national reference labs
this week were Influenza A (breakdown below):
100% of subtyped isolates were 2009 Pandemic A (H1N1)
0% were seasonal A (H1)
0% were seasonal A (H3)
Note: 57.6% (72 of 125) of isolates were not subtyped
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3.1% were Influenza B
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The majority of influenza viruses currently circulating in the U.S. are 2009
Pandemic Influenza A (H1N1)
This antiviral susceptibility profile is compiled by CDC and represents strains identified since September 1, 2009. The results of antiviral resistance testing performed are summarized in the table below.
Samples |
Tested |
% Resistant to Oseltamivir |
Tested |
% Resistant to Zanamivir |
Tested |
% Resistant to Adamantanes |
| 2009 Pandemic A (H1N1 |
3,691 (1.3%) |
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1,305 |
0% |
1.262 |
99.8% |
| Seasonal A (H1) |
1 (100%) |
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0 |
0 |
1 |
0 |
| Seasonal A (H3) |
11 (0%) |
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0 |
0 |
12 |
100% |
| Influenza B |
70 |
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0 |
0 |
N/A |
N/A |
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2009 Pandemic Influenza A (H1N1) Vaccine Information:
- Due to the decrease in demand for the H1N1 vaccine and completion of
vaccine shipments, H1N1 vaccine distribution information will be discontinued
at this time.
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| Guidance: |
New CDC guidance available. Follow this link
- Update: FDA Questions and Answers for Health Care Providers: Renal Dosing and Administration Recommendations for Peramivir IV (Posted Friday, November 13, 2009).
- New: 2009 H1N1 Flu Information for People with Disabilities and Their Caregivers or Personal Assistants (Posted Monday, November 16, 2009).
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Hospital Data:
In the News:
- Minimal stories continue to run in local and statewide newspapers and
television stations regarding the H1N1 flu and vaccine. No major rumors or
incorrect information has been detected this week in local and statewide
newspapers and television outlets.
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