This book is a collection of articles written by prominent scientists who gathered in the city of Recife, Brazil, 23-27 October 2010, celebrating the 10th International Symposium on Yersinia. The event is held every four years in a different country and for the Yersinia 2010. The major advances achieved over the past four years since the last symposium held in Lexington, USA in 2006 were divided into eight chapters : epidemiology, clinical, diagnostic and therapeutic aspects ; ecology and modeling ; genomic/transcriptomics and large scale population ; immune response and vaccine ; pathogenesis and pathogenicity factors ; cellular yersiniology ; bacterial structure and metabolism ; roles in pathogenesis and bacterial life style.