Current Influenza Statistics
Influenza statistics are updated every Thursday at 10:00 a.m.
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The Oklahoma State Department of Health (OSDH) has designated hospitalizations of patients with a laboratory test result indicating influenza as the diagnosis and influenza-associated deaths as reportable conditions beginning September 1, 2009 pursuant to the Oklahoma Reportable Disease Rules (Oklahoma Administrative Code Title 310, Chapter 515, Section 1-6). OSDH will monitor reports of influenza-associated hospitalizations and deaths to better describe severe manifestations of influenza, monitor temporal trends of influenza-associated hospitalizations, and further evaluate risk factors for novel swine-origin influenza A H1N1 complications.
The purpose of the influenza statistics page is to provide weekly summaries of influenza information obtained from the OSDH influenza sentinel surveillance system, influenza test results from the OSDH Public Health Laboratory, and the number of influenza-associated hospitalizations and mortalities reported to the OSDH Acute Disease Service. Influenza statistics will be updated every Thursday morning at 10:00 a.m.
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Report for Week Ending November 14, 2009
• 6% of outpatient visits statewide met the criteria
for influenza-like illness1 (ILI) for the current reporting
week, which is a decrease from 8% reported
during the previous week;
• ILI activity declined for the fourth straight week
since activity initially peaked in mid-October when
sentinel providers reported 18% of patients met ILI
criteria; and
• the OSDH Public Health Laboratory tested 93
specimens, of which 24 were positive for influenza.
All were confirmed as swine-origin influenza A
(H1N1).
Influenza Hospitalization Surveillance
September 1 - November 14, 2009
• 918 reported cases of influenza-associated
hospitalizations;
• 506 (55%) of the 918 hospitalizations were
patients under 19 years of age;
• 57 (6%) of those hospitalized were pregnant women;
•128 patients have been admitted to the ICU, of
which 37 (29%) patients were under 19 years of age;
and
• the age-specific incidence rate per 100,000
population of influenza-associated hospitalizations
was highest for children less than 5 years of age
(91.9) and children 5—18 years of age (37.9)
compared to adults 19—24 years of age (17.5), 25-
49 years of age (13.6), 50—64 years of age (18.1),
and persons 65 years of age and older (14.5).
Influenza-Associated Mortality Surveillance
• Six influenza-associated deaths were reported
during the current reporting week resulting in a total
of 33 since surveillance began September 1, 2009;
o Reported deaths have been among individuals in
the following age groups: 9 were children less
than 19 years of age; 11 were adults 25- 49
years of age; 8 were adults 50-64 years of age;
and 5 were 65 years and older;
o 23 (70%) of 33 influenza-associated deaths had
documented history of at least one underlying
medical condition that may have increased their
risk of influenza complications, including asthma
and other respiratory conditions, diabetes,
obesity, or an immunocompromising condition.
o County of residence: Oklahoma (10), Tulsa (8),
Carter (2), Cleveland (3), Canadian (1), Comanche
(2), Garfield (1), Kay (1), LeFlore (1), Muskogee
(1), Custer (1), Kiowa (1), and Noble (1).
1Influenza-like illness is defined as having a fever (>100°F) combined with a cough and/or a sore throat
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Change in Proportion of Influenza-like Illness Reported by Sentinel Physicians by Region

Weekly Percent of Influenza-like Illness Based on Total Patient Visits to Sentinel Clinicians

Number of Influenza Hospitalizations by Age Group - Current Week

Cumulative Number of Influenza Hospitalizations by Age Group

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Number of Reported Influenza-Associated Hospitalizations and Deaths,
Oklahoma, September 1 - November 14, 2009
| Number of New Hospitalizations for Week Ending* November 14, 2009 |
Cumulative Hospitalizations Since September 1, 2009 |
Cumulative Deaths
Since September 1, 2009 |
| 46 |
918 |
33 |
* These units correspond to the number of weeks in a year and allow for a comparison between multiple seasons
For National Statistics from CDC on Reported H1N1 Flu Hospitalizations and Deaths: http://www.cdc.gov/h1n1flu/update.htm#totalcases