Microbiology is an ever changing subject, but the need of the hour is an all-encompassing but concise, informative book on aspects like practical tests, spots and viva, especially for MBBS and nursing students. This book was conceptualised keeping these things in mind. Numerous diagrams , flow charts and tables have been included keeping these things in mind. Topics like fungi and Mycoplasma spp. Have been covered, too. The authors are indebted to the publishers and all those whose books and articles have been referred to for this book. We sincerely hope that this book is an aid to undergraduate MBBS and nursing students and is also helpful for Postgraduate students and researchers in Microbiology.