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Volume 18, Number 5—May 2012


Emergency Department Visits for Influenza A(H1N1)pdm09, Davidson County, Tennessee, USA

Wesley H. Self, Carlos G. Grijalva, Yuwei Zhu, H. Keipp Talbot, Astride Jules, Kyle E. Widmer, Kathryn M. Edwards, John V. Williams, David K. Shay, and Marie R. GriffinComments to Author 
Author affiliations: Vanderbilt University, Nashville, Tennessee, USA (W.H. Self, C.G. Grijalva, Y. Zhu, H.K. Talbot, A. Jules, K.E. Widmer, K.M. Edwards, J.V. Williams, M.R. Griffin); Veterans Affairs Tennessee Valley Health Care System, Nashville (W.H. Self, M.R. Griffin); Centers for Disease Control and Prevention, Atlanta, Georgia, USA (D.K. Shay)

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Table 2

Estimated emergency department visits for influenza A(H1N1)pdm09, Davidson County, Tennessee, USA, May 1, 2009–March 31, 2010*

Patient age, y County population No. visits/1,000 population (95% CI)
Surveillance sampling estimates Capture–recapture estimates
<5 47,446 26.3 (15.2–42.7) 19.3 (11.0–38.3)
5–17 93,710 16.3 (8.90–27.9) 22.0 (12.0–46.5)
18–49 318,006 10.9 (7.48–17.2) 9.08 (5.67–22.6)
>50 176,548 2.85 (1.05–7.77) 3.60 (NC)
Total 635,710 10.6 (6.48–18.0) 10.2 (NC)

*NC, not calculated because of no matched cases in patients >50 years of age.

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