Frequency United States An estimated 2 million cases of<unk>  enteritis occur annually, accounting for 5–7% of cases of gastroenteritis.<unk>  organisms have a large animal reservoir, with up to 100% of poultry, including chickens, turkeys, and waterfowl, having asymptomatic intestinal infections. The major reservoirs of C. fetus are cattle and sheep. Nonetheless, the incidence of<unk>  infections has been declining. Changes in the incidence of culture-confirmed<unk>  infections have been monitored by the Foodborne Diseases Active Surveillance Network (FoodNet) since 1996. In 2010,<unk>  incidence showed a 27% decrease compared with 1996–1998. In 2010, the incidence was 13.6 cases per 100,000 population, and this did not change significantly compared with 2006–2008. International<unk>  infections are extremely common worldwide, although exact figures are not available. New Zealand reported the highest national<unk> iosis rate, which peaked in May 2006 at 400 per 100,000 population. Sex<unk>  is more frequently isolated in males than females, and homosexual men appear to have a higher risk of infection by atypical<unk>  species such as Helicobacter cinaedi and Helicobacter fennelliae. Age<unk>  infections can occur in all age groups. Studies show a peak incidence in children younger than 1 year and in people aged 15–29 years. The age-specific attack rate is highest in young children. In the United States, the highest incidence of<unk>  infection in 2010 was in children younger than 5 years and was 24.4 cases per 100,000 population, However, the rate of fecal cultures positive for<unk>  species is greatest in adults and older children.
Campylobacter jejuni
Campylobacter upsaliensis
Salmonella
Yersinia enterocolitica
Salmonella enterica subsp. enterica
Escherichia coli O157:H7
Clostridioides difficile 
Enteroaggregative Escherichia coli