This book is the full research of the paper" Bartonella Species in Fleas from Palestinian Territories: Prevalence and Genetic Diversity". In addition,this work has been published in a peer reviewed journal: Journal of Vector Ecology; 2014; 39 (2): 261-270. Indeed, this is the first time that Bartonella spp detected from fleas collected in Palestine. The authors hope this work pave the way toward more achievements in this field.