| a large nontypical outbreak of norwalk virus. gastroenteritis associated with exposing celery to nonpotable water and with citrobacter freundii. | the us air force academy experienced a point-source outbreak of gastroenteritis originally believed to be caused by salmonella. the overall attack rate was 48% among approximately 3000 cadets and staff. food-specific attack rates implicated chicken salad. the odds ratio for chicken salad consumption in ill cadets was 10.7 (95% confidence interval: 8.2; 13.8). the celery component had been exposed to nonpotable water. citrobacter freundii were statistically associated with consumption of the susp ... | 1991 | 1660704 |