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Change in the incidence rate of laboratory-confirmed Yersinia enterocolitica infection in children <5 years old during 2009, relative to the average incidence rate during 1996–1998, Foodborne Diseases Active Surveillance Network, 1996–2009. Data were calculated using the negative-binomial model. The position of the line indicates the relative change in the incidence compared with 1996–1998. The actual incidence of infection cannot be determined from this graph.
