An investigational analysis of an episode of food poisoning of Salmonella enteritis misdiagnosed as typhoid fever

Objective The present study was conducted to investigate the characteristics of an episode of school food poisoning caused by Salmonella enteritis but misdiagnosed as typhoid fever in Zengcheng city in 2005．Methods Field epidemiological investigations and case-control study were conducted．The collected samples were cultured for the identification of intestinal pathogens with Widal reaction done．Results Among the 22 cases reported in the epidemic outbreak，11 cases had increased antibodies of anti一“O”and anti “H” over 1:160．Stool culture was done for 19 cases with Salmonella enteritidis positive in 4 of them．All the cases had a history of repast in the school cafeteria．The collection of the suspected poisonous foods failed．There was statistically a significant difference in the results of Widal reaction between the cases and the controls．Suggesting that the chicken legs might be the suspected poisonous food．Conclusion According to the resuks of epidemiological investigation，clinical manifestation of the cases and the results of laboratory tests．It had been established as outbreak 0f flood poisoning of salmonella enteritis．