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

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