Salmonella comprises of two species (enterica and bongori) and is said to be an intensely variegated genus which infects a variety of hosts. This group is made up of 2579 serovars which fascinates researchers and draws their attention towards its different characteristics. Salmonella causes problems of zoonoses and also leads to food borne illness. Diseases caused by salmonella are becoming a matter of concern for developed and developing countries because of their impact on economy and other important sectors. Antimicrobial resistance in salmonella makes it difficult to reveal different mechanisms involved and this problem seems to increase further. This book presents new developments and researches in the field of salmonella from across the globe. It includes important topics such as immunological responses to salmonella, mechanisms of pathogenesis and diagnosis of salmonella infections. Internationally acclaimed researchers and practitioners in this field have made their valuable contributions to this book.