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Texas ILINet Structure and Operation 2002-2008

Texas ILINet Structure and Operation 2002-2008. 86 th Annual Texas Public Health Association Conference April 21-23, 2010 South Padre Island, Texas Gary Heseltine MD MPH Infectious Disease Control Unit. Chronic Illnesses Demand Chronic Attention. Overview. What is ILINet

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Texas ILINet Structure and Operation 2002-2008

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  1. Texas ILINet Structure and Operation 2002-2008 86th Annual Texas Public Health Association Conference April 21-23, 2010 South Padre Island, Texas Gary Heseltine MD MPH Infectious Disease Control Unit Chronic Illnesses Demand Chronic Attention

  2. Overview • What is ILINet • What is the structure of ILINet • Where does the data come from • Who is represented • How does ILINet operate • Data handling • Stability of operation • Possible Improvements to ILINet

  3. Influenza Like Illness (ILI) Net • CDC hosted syndromic reporting system • Fever > 100o F and cough or sore throat • Clinicians report weekly • Total number patient visits • Total number of patients diagnosed with ILI • Cases divided into 4 age strata • Statewide weekly ILI index • Combine data from all clinicians ILIindex= total ILI patients/total patient visits

  4. Texas ILI Index: What Does It Mean?

  5. ILINet Evolution

  6. Reporters

  7. Total Number of Weekly Submissions by Reporter 2002-2008

  8. Weighting

  9. 8

  10. Tuning Surveillance Levels Weightcounty Data Viewcounty Weightblock Data Viewblock

  11. ILINet Data: Two Issues • ILINet data reported to the state does not reflect county populations • Weight county contributions to reflect underlying population proportion • Use sampling index to guide resource allocation and recruiting for ILINet to obtain proportionality • Sampling method itself: non-probability • Clinicians (reporters) are volunteers- bias • Convenience sample - bias • Use a probability sample to correct for ILINet sampling bias before submission to the state

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