Synopsis Many of the health problems in developing countries like India are different form those in developed countries. Bacterial diseases still play a considerable role in diseases in our country. Topics such as cholera and enteric diseases are important to us. The increasing importance of the newer knowledge in immunology to health and diseases is not adequately stressed in most of the textbooks. Virus diseases which are responsible for nearly sixty percent of human illness requires wider coverage. The general approach to the teaching of microbiology in our country has also been rather static. This book is an attempt to provide an up-to-date and simplified study of medical Microbiology to the students at the undergraduate level of several universities. Inputs from focus groups of medical students was invaluable in developing the educational approach of this textbook.