Volume 18, Number 5—May 2012
Dispatch
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. Griffin
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).
