Microbiology is one of the most important subject not only in Veterinary Sciences and Animal Husbandry but also in Medical sciences. This book is written based on the most relevant and current information of microbiology in the form of objective type questions so that everybody can read and understand it properly. The book is useful for scientists, teachers, students, officers, diagnosticians, laboratory technicians, public health professionals and medial personnel associated directly or indirectly with research, teaching, training, extension, diagnosis, epidemiology and control of diseases of microbial origin such as bacteria, parasite, virus, rickettsia, mycoplasma, chlamydia, fungi etc. The detailed information has also been provided on emerging and reemerging diseases of animals and humans. This book will provide up to date information of all the diseases of various etiologies which are of serious human and animal health threat globally. The objective type questions of various kinds on different diseases have been provided so that students, researchers, examinees, trainees etc can face any challenge with a certain degree of profound confidence. This book will be extremely useful to all the persons who are directly or indirectly involved in the diagnosis and epidemiological investigations of human and animal diseases and their welfare. Finally, all can enrich their knowledge on any aspects of microbiology from the book and clarify any doubts and concepts very easily and confidently.