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Volume 19, Number 8—August 2013

Dispatch

Acute Gastroenteritis Surveillance through the National Outbreak Reporting System, United States

Aron J. HallComments to Author , Mary E. Wikswo, Karunya Manikonda, Virginia A. Roberts, Jonathan S. Yoder, and L. Hannah Gould
Author affiliations: Centers for Disease Control and Prevention, Atlanta, Georgia, USA

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Table 2

Primary transmission mode and exposure setting of acute gastroenteritis outbreaks, by etiologic agent, National Outbreak Reporting System, United States, 2009–2010*

Outbreak characteristic No. (%) outbreaks
Norovirus, n = 1,908 Salmonella spp., n = 355 Shigella spp., n = 109 STEC, n = 101 Other, n = 379† Unknown, n = 1,524 Total, N = 4,376
Primary transmission mode
Person to person 1,261 (66.1) 17 (4.8) 86 (78.9) 11 (10.9) 47 (12.4) 849 (55.7) 2,271 (51.9)
Foodborne 494 (25.9) 254 (71.5) 8 (7.3) 64 (63.4) 220 (58.0) 473 (31.0) 1,513 (34.6)
Waterborne 4 (0.2) 0 2 (1.8) 6 (5.9) 51 (13.5) 2 (0.1) 65 (1.5)
Animal contact 0 26 (7.3) 0 5 (5.0) 12 (3.2) 1 (0.1) 44 (1.0)
Environmental contamination 5 (0.3) 2 (0.6) 1 (0.9) 0 0 1 (0.1) 9 (0.2)
Unknown
144 (7.5)
56 (15.8)
12 (11.0)
15 (14.9)
49 (12.9)
198 (13.0)
474 (10.8)
Exposure setting‡
Health care facility 932 (48.8) 5 (1.4) 0 0 25 (6.6) 537 (35.2) 1,499 (34.3)
Restaurant or banquet facility 287 (15.0) 69 (19.4) 5 (4.6) 12 (11.9) 77 (20.3) 207 (13.6) 657 (15.0)
School or day-care facility 98 (5.1) 14 (3.9) 50 (45.9) 6 (5.9) 15 (4.0) 107 (7.0) 290 (6.6)
Private residence 31 (1.6) 62 (17.5) 4 (3.7) 28 (27.7) 60 (15.8) 42 (2.8) 227 (5.2)
Other single setting 114 (6.0) 42 (11.8) 9 (8.3) 15 (14.9) 101 (26.6) 98 (6.4) 379 (8.7)
Multiple 33 (1.7) 19 (5.4) 13 (11.9) 10 (9.9) 10 (2.6) 21 (1.4) 106 (2.4)
Not reported 264 (13.8) 86 (24.2) 15 (13.8) 15 (14.9) 42 (11.8) 313 (20.5) 735 (16.8)
Not collected§ 149 (7.8) 58 (16.3) 13 (11.9) 15 (14.9) 49 (12.9) 199 (13.1) 483 (11.0)

*Data include both suspected and confirmed etiologies. STEC, Shiga toxin-producing Escherichia coli.
†Includes outbreaks caused by a single etiologic agent other than norovirus, Salmonella spp., Shigella spp., and STEC or by multiple etiologic agents, as listed in Table 1.
‡Data on specific settings are restricted to outbreaks with a single exposure setting; for foodborne outbreaks, setting refers to the setting where implicated food was consumed.
§The setting was systematically not collected for outbreaks caused by environmental contamination or unknown transmission mode.

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