Outbreak of Salmonella Braenderup infections associated with Roma tomatoes, northeastern United States, 2004: a useful method for subtyping exposures in field investigations. - Gupta SK; Nalluswami K; Snider C; Perch M; Balasegaram M; Burmeister D; Lockett J; Sandt C; Hoekstra RM; Montgomery S (Epidemiology & Infection, 2007)