This second edition of the textbook has been significantly revised and expanded to reflect recent changes in the epidemiology and economic importance of various infectious diseases, incorporating new advances in infectology and updates to the curriculum. The first part, *Infectious Diseases – General Issues of Infectious Pathology*, covers the classification of infectious diseases, the infectious process and disease, etiological classification, and key characteristics of infectious illnesses. The second part, *Specific Topics in Infectious Pathology*, delves into bacterial infections, viral diseases, prion disorders, protozoan infections, mycoses, and helminthiasis. Designed primarily for students in medical and preventive healthcare faculties, this textbook also serves as a valuable resource for those studying tropical medicine and for postgraduate training of physicians specializing in infectious diseases.