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In 2008, a total of 18,499 laboratory-confirmed cases of infection in FoodNet surveillance areas were identified. The number of infections and incidence per 100,000 population were reported as follows: Salmonella (7,444; 16.20), Campylobacter (5,825; 12.68), Shigella (3,029; 6.59), Cryptosporidium (1,036; 2.25), STEC O157 (513; 1.12), STEC non-O157 (205; 0.45), Yersinia (164; 0.36), Listeria (135; 0.29), Vibrio (131; 0.29), and Cyclospora (17; 0.04). Substantial variation in incidence rates occurred among surveillance areas (Table 1). Among all age groups (<4 years, 4–11 years, 12–19 years, 20–49 years, and >50 years)†, the highest incidence occurred among children aged <4 years for all infections except those caused by Cyclospora and Vibrio.
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Among age groups of persons infected with the following pathogens, the percentage of persons hospitalized was highest in persons aged >50 years: Listeria (86.2%), STEC O157 (53.3%), Vibrio (45.6%), Salmonella (40.0%), Yersinia (37.5%), Shigella (27.9%), Cryptosporidium (24.5%), and Campylobacter (20.5%). Among age groups of persons infected with the following pathogens, the case fatality rate (CFR) was highest in persons aged >50 years: Listeria (19.5%), Vibrio (7.4%), Salmonella (1.3%), Shigella (0.4%), and Campylobacter (0.4%). For infection with STEC O157, the CFR was highest among children aged <4 years (2.8%); for infection with Cryptosporidium and Yersinia, the CFR was highest in persons aged 20–49 years (1.3% and 3.0%, respectively).
Among 6,750 (91%) Salmonella isolates serotyped, 10 serotypes accounted for 73% of infections: Enteritidis, 1,356 (20.1%); Typhimurium, 1,077 (16.0%); Newport, 681 (10.1%); Javiana, 423 (6.3%); Saintpaul, 403 (6.0%); I 4,[5],12:i:-, 269 (4.0%); Muenchen, 213 (3.2%); Heidelberg, 198 (2.9%); Montevideo, 194 (2.9%); and Braenderup, 108 (1.6%). Among 131 (92%) Vibrio isolates for which the species was identified, 72 (55.0%) were parahaemolyticus, 19 (14.5%) were vulnificus, and eight (6.1%) were alginolyticus. Among 205 STEC non-O157 isolates tested for O antigen determination, 185 (90%) had an identifiable O antigen, most commonly O26 (28.1%), O103 (27.0%), or O111 (19.5%).