In this edition few chapters are revised like in chapter 1, ICD-11 are incorporated, in chapter 5, oral questions on immunization and vaccine related issues are added, communicable and non-communicable diseases, reproductive and child health, demography and family planning chapters are fully revised. In chapter 6, overview of Covid-19 and available vaccines are described in brief. In chapter 15, guidelines for handling, treatment and disposal of waste generated from Covid-19 patients are also incorporated. In chapter 21, Integrated Disease Surveillance Programme (IDSP) is revised. Apart from that in chapter 22, MCQs (231) are picked up from different universities questions. Few true-false and fill in the blanks questions are also provided in chapters 23 and 24 that will help both UG and PG students. This book is written as per new MCI curriculum 2019 which is based on competency