The sixth edition of Textbook of Microbiology Is thoroughly revised and updated which aims to keep pace with the rapidly increasing information in medical sciences. A chapter on automation in microbiology has been added. Zika virus has been described in chapter of arboviruses. The text Is presented in simple and lucid manner. It is illustrated with coloured and computer-drawn figures, clinical photographs and photomicrographs. These make the book colourful and readers can have better understanding of the biology of microorganisms. Each chapter ends with key facts, and essay type, short answer type and multiple choice questions. The former summarizes the whole chapter, and the latter help the student to know the type of questions asked in the examination. Overview of microbiology in the last chapter summarizes the whole book. The book is user-friendly, easy to understand, and will be highly useful to MBBS, BDS, MSc and MD microbiology students.