Re: Tennessee %ILI week 41 (ending Oct 17th)
Re: Tennessee %ILI week 41 (ending Oct 17th)
Sentinel Provider Influenza-Like Illness (ILI) Surveillance Summary
For the Week of October 25-31, 2009 (Week 43)
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The CDC reports that the percentage of patients visiting outpatient healthcare providers in the Sentinel Provider Network (SPN) with
influenza-like-illness (ILI) when influenza viruses are not circulating is expected to fall at or below a specific SPN baseline [nationwide =
2.2%, East South Central region (AL, TN, MS, KY) = 2.4%]. When the percentage of patients with ILI exceeds this baseline, this
suggests that influenza viruses may be circulating.
The percentage of patients with ILI reported by the TN SPN was 4.77% for Week 43 - up from 3.87% reported in Week 42. Of 123 specimens
tested, 36 (29.3%) were positive by PCR for influenza: 100% were pandemic H1N1. ILI is defined as fever > 100?F (37.8?C) plus cough
and/or sore throat, in the absence of a known cause (other than influenza). Classification of ILI is based upon symptoms only and does
not require any test. The SPN Protocol (eff. Sept 1, 2009): SPs report ILI by the end of Tuesday following the end of the reporting week;
collect and ship specimens from ILI cases on Mondays and/or Wednesdays (maximum 10/wk) using the SPN Specimen Collection Form
dated 8/21/09. Complete the lab supply order form to receive new specimen collection supplies.
*The percentage of influenza-like-illness patients seen in each region is compared to the statewide average. Regions with percentages
statistically-significantly different from the state average are noted as ?higher? or ?lower."
For full report, see attachment:
View attachment week43ILI_spnreport_2009.pdf