It tells the story of various virus and bacterial attacks experienced in human history. The history of human illness is the history of these bacteria and viruses raging. Many infectious diseases have brought mankind to the brink of death and even directly destroyed the country. The core that I want to know most in this book is COVID-19, and the direct contrast with COVID-19 is SARS. This book has benefited me a lot. Viruses have lived on the earth for longer than our human history. Viruses coexist with the earth, and any living individual has beneficial bacteria and viruses. Like all living things, the task of viruses is to prolong their lives as long as possible. In order to achieve this goal, viruses are everywhere.