Book is about common bacteriological agents of diarrhoea, dysentery and their sensitivity towards various allopathic medicines used for treatment. Having a practical approach, useful for medical practitioners, physicians, microbiologists, lab technicians, researchers, academicians, health-hygiene planners and policy makers equally. Throughout field and laboratory work, WHO Manual for Laboratory investigation of Acute Enteric Infections (WHO Manual CDD/833) has been followed to ensure its international standards.