Viruses have entered our lives so tightly and have complicated it so much that it is impossible to deny their existence. And in general, an enemy, like a friend, must be known by sight, because knowledge is power. You ask: - Author, but we know our enemies. These are viruses. Who are your friends? - Elementary! - I will answer. – Of course, immunity and vaccination! But let’s not go into chatter and start talking to the point. This book will tell you about how viruses enter the body, how they affect it and how to resist them. And also how vaccines were created, how our ancestors fought epidemics, and why the immune system is still considered smarter than the brain. You will learn everything you would like, and even a little more. And everything you learn will be true. This is a very clear and very true book.