The concepts of "psiviruses, memes, mind viruses, mental viruses" have become widespread in the modern cultural context. Their nature and influence on man has also been explored in various wisdom traditions. Based on ancient traditions and modern approaches in the field of cognitive science, memetics, psycholinguistics and other areas, this book describes the forms of psiviruses and their impact on consciousness. Particular attention is paid to practical methods for clearing psiviruses and blocking their activity.