Salmonella Derby clonal spread from pork

The genetic diversity of the Derby serotype of Salmonella enterica in Spain was examined by pulsed-field gel electrophoresis (PFGE). Out of 24 identified PFGE profiles, a major clone was detected in 19% of strains from humans, 52% from food, and 62% from swine. This clone (clone 1) was isolated from pork products, suggesting swine as its source.This work was supported by a grant from the Ministerio de Ciencia y Tecnología (AGL 2002-04161-02-01). Sylvia Valdezate and Ana Vidal were supported by fellowships from Instituto de Salud Carlos III (02/0008) and the Junta de Castilla y León, respectively.S