Sentinel Surveillance Summary for February 5 through February 11, 2012

• The percentage of outpatient visits meeting the criteria for ILI¹ was 3.1% (118/3,752). 
• 1.9% (6/314) of the rapid influenza tests performed by sentinel laboratories were positive; all six specimens indicated infection with type A influenza viruses.
• Nine specimens were submitted to the OSDH Public Health Laboratory (PHL) for influenza testing; three (33.3%) specimens were positive for influenza by polymerase chain reaction (PCR) testing.  All three specimens indicated infection with influenza A 2009 H1N1. 
• Since September 1, 2011, 7 of 73 (9.6%) specimens tested by the OSDH PHL by PCR were positive for influenza.  Two (28.6%) specimens were positive for influenza A (H3), three (42.9%) were positive for influenza A 2009 H1N1, and two (28.6%) were positive for influenza B.

Influenza-Associated Hospitalization Surveillance for 2011-2012 Season

• Between January 1 and February 11, 2012, 23 cases of influenza-associated hospitalizations were reported to OSDH.  During the same time frame last year, 620 influenza-associated hospitalizations were reported.
• Influenza-associated hospitalizations have been reported among residents of the following counties:  Cleveland (2), Garfield (2), McClain (2), Muskogee (1), Oklahoma (5), Okmulgee (1), Osage (1), Payne (1), Seminole (1), Sequoyah (1), Tulsa (5), and Wagoner (1).
• Fifty-seven percent of hospitalizations occurred among those 19-64 years of age.
• No influenza-associated deaths have been reported.

¹Influenza-like illness is defined as having a fever (>100°F) combined with a cough and/or a sore throat.

Number of Reported Influenza-Associated Hospitalizations and Deaths, 
Oklahoma, January 1, 2012 – February 11, 2012

Additional Viral Respiratory Surveillance Data

Weekly Viral Respiratory Testing Table
Weekly Percent Positive RSV Testing Graph 2009-2012

For Weekly National Statistics from CDC:  http://www.cdc.gov/flu/weekly/

National Information
CDC Flu Activity Level Criteria
United States Influenza Activity Map

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

Weekly Hospitalizations by Age Group and Admission Week

Weekly Percent Positive Influenza Testing Graph 2009-2012

Weekly Influenza Viral Testing Graph