Microbial pathogens are microorganisms that are capable of producing disease. Virtually all groups ofbacteria have some members that are pathogens. A human pathogen is a pathogen (microbe ormicroorganism such as a virus, bacterium, prion, or fungus) that causes disease in humans. There areseveral substrates including pathways where the pathogens can invade a host. Diseases caused byorganisms in humans are known as pathogenic diseases. The methods of detecting and identifyingmicrobial pathogens involved culturing and isolating bacterial colonies in growth media in the lab.Withthe advent of polymerase chain reaction (PCR) assays, identification of microorganisms that weredifficult or impossible to culture became possible. Many microbial pathogens can be controlled withantimicrobial drugs called antibiotics. This book will cater to the immediate needs of the students,researchers, faculty members and pharmaceutical industries in India and abroad. This book provides aconcise but comprehensive description of human infectious diseases due to microbial pathogens.