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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 1

Estimated total number of emergency department visits for influenza A(H1N1)pdm09, calculated by surveillance sampling method, Davidson County, Tennessee, USA, May 1, 2009–March 31, 2010*

Patient age, y No. ARI or fever visits countywide†
% ARI or fever visits to surveillance emergency departments for influenza A(H1N1)pdm09‡
Estimated no. visits for influenza A(H1N1)pdm09 countywide
Prepeak Peak Postpeak Prepeak Peak Postpeak
<5 3,135 6,461 5,219 0 19.0 0 1,249
5–17 1,599 5,269 2,324 15.0 24.0 0 1,528
18–49 7,322 11,523 10,486 2.4 23.0 6.3 3,455
>50 5,085 6,832 7,046 0 6.2 1.5 503

*ARI, acute respiratory infection.
†Data from Tennessee Hospital Discharge Data System (9).
‡Data from Influenza Vaccine Effectiveness Study (Vanderbilt University, Nashville, TN, USA).

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