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Volume 15, Number 6—June 2009

Research

Case-based Surveillance of Influenza Hospitalizations during 2004–2008, Colorado, USA

Rosemary Proff, Ken GershmanComments to Author , Dennis Lezotte, and Ann-Christine Nyquist
Author affiliations: University of Colorado Denver, Colorado, USA (R. Proff, D. Lezotte, A-C. Nyquist); Colorado Department of Public Health and Environment, Denver (K. Gershman)

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Table 1

Characteristics of patients hospitalized with influenza, Colorado, USA, 2004–08 influenza seasons*

Characteristics Influenza season (October 1–May 31), no. (%) patients
2004–05 2005–06 2006–07 2007–08
Total recorded cases
978
848
367
1,004
Influenza type
A 777 (79.45) 699 (82.43) 345 (94.01) 629 (62.65)
B 127 (12.99) 110 (12.97) 12 (3.27) 343 (34.16)
Unknown
74 (7.57)
39 (4.60)
10 (2.72)
32 (3.19)
Age
<6 mo 64 (6.54) 81 (9.55) 39 (10.63) 79 (7.87)
6–23 mo 72 (7.36) 103 (12.15) 46 (12.53) 78 (7.77)
2–4 y 56 (5.73) 59 (6.96) 27 (7.36) 65 (6.47)
5–17 y 56 (5.73) 72 (8.49) 29 (7.90) 74 (7.37)
18–49 y 140 (14.31) 86 (10.14) 78 (21.25) 180 (17.93)
50–64 y 149 (15.24) 103 (12.15) 39 (10.63) 142 (14.14)
65–79 y 201 (20.55) 169 (19.93) 56 (15.26) 179 (17.83)
>80 y
240 (24.54)
175 (20.64)
53 (14.44)
207 (20.62)
Gender
M 488 (49.90) 405 (47.76) 186 (50.68) 461 (45.92)
F 485 (49.59) 443 (52.24) 180 (49.05) 517 (51.49)
Unknown
5 (0.51)
0 (0.00)
1 (0.27)
26 (2.59)
Region*
Western Slope 57 (5.83) 100 (11.79) 31 (8.45) 94 (9.36)
Northern Front Range 122 (12.47) 108 (12.74) 48 (13.08) 121 (12.05)
Denver Metro 550 (56.24) 383 (45.17) 210 (57.22) 520 (51.79)
South Central 36 (3.68) 32 (3.77) 8 (2.18) 14 (1.39)
San Luis Valley 7 (0.72) 8 (0.94) 12 (3.27) 15 (1.49)
Southern Front Range 174 (17.79) 177 (20.87) 48 (13.08) 205 (20.42)
Eastern Plains 32 (3.27) 40 (4.72) 10 (2.72) 35 (3.49)

*Colorado regions can be further divided into counties: Western Slope: Archuleta, Delta, Dolores, Eagle, Garfield, Grand, Gunnison, Hinsdale, Jackson, La Plata, Mesa, Moffat, Montezuma, Montrose, Ouray, Pitkin, Rio Blanco, Routt, San Juan, San Miguel, Summit; Northern Front Range: Larimer, Weld; Denver Metro: Adams, Arapahoe, Boulder, Broomfield, Denver, Douglas, Jefferson; South Central: Chaffee, Clear Creek, Custer, Fremont, Gilpin, Huerfano, Lake, Las Animas, Park, Teller; San Luis Valley: Alamosa, Conejos, Costilla, Mineral, Rio Grande, Saguache; Southern Front Range: El Paso, Pueblo, and Eastern Plains: Baca, Bent, Cheyenne, Crowley, Elbert, Kiowa, Kit Carson, Lincoln, Logan, Morgan, Otero, Phillips, Prowers, Sedgwick, Washington, Yuma.

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