Report for Week Ending January 30, 2010

• 2.1% of outpatient visits statewide met the criteria for influenza-like illness¹ (ILI) for the current reporting week which is similar to 2.0% reported during week ending January 23.
• The proportion of outpatient visits due to ILI increased in the NW region from 3.9% to 4.7% during week ending January 30.  
• 38.6% of respiratory syncytial virus (RSV) tests performed by sentinel laboratories were positive for this reporting period which is a decrease from 51.2% reported during week January 23.
• 5 of 22 respiratory specimens tested at the OSDH Public Health Laboratory (PHL) were positive for swine-origin influenza A (H1N1).
• Since September 1, the OSDH PHL has tested 1,604 specimens for influenza; 973 were positive for swine-origin influenza A (H1N1), 10 were positive for influenza B, and one was positive for influenza A (H3).  620 specimens tested negative for influenza or had insufficient RNA.  

Influenza Hospitalization Surveillance 
September 1, 2009 - January 30, 2010

• 1,081 cases of influenza-associated hospitalizations were reported resulting in an incidence rate of 29.7 per 100,000 Oklahoma population.
• 68 (6%) influenza-associated hospitalizations have occurred among women who were pregnant.
• The age-specific incidence rate per 100,000 population of influenza-associated hospitalizations was highest for children less than 5 years of age (113) and children 5—18 years of age (41) compared to adults 19—24 years of age (21), 25-49 years of age (16), 50—64 years of age (22), and 65 years of age and older (18).
• The race-specific incidence rate per 100,000 population of influenza-associated hospitalizations was highest for African Americans (55) and Native Americans (37) compared to persons who reported their race as White (26) and Asian (21).

Influenza-Associated Mortality Surveillance

• 40 influenza-associated deaths were reported since surveillance began September 1, 2009; no new reports during January 24-30.

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

Number of Influenza Hospitalizations by Admissions Week

Number of Influenza Deaths by Week