A pleasant event for specialists in immunology and specialties related to immunology took place this year. A new, 4th edition of the textbook "Immunology" has been published, prepared by the famous Russian immunologist, Academician of the Russian Academy of Sciences Rakhim Musaevich Khaitov. Compared to the previous edition, issued in 2018, this version is a substantially updated and revised version, replenished with information obtained during this relatively short period by world immunology, one of the most rapidly developing areas of scientific knowledge. With all the complexity of modern immunology, this training manual has achieved a perfect in form, consistent and at the same time accessible presentation of the material in accordance with the latest international data. Attention is drawn to the appropriate placement of perfectly done illustrations that explain the text material and create liveliness, interest and accessibility to its development. Special attention should be paid to the fact that after getting acquainted with the deeply and easily presented material about the structure and function of the immune system, the reader is fully prepared for an easier perception of special clinic-oriented information, in particular, on allergies in the chapter "Allergic diseases" presented in in accordance with the principles of evidence-based medicine, modern international and national guidelines and consensus documents. Undoubtedly, the textbook will be an irreplaceable guide for students and teachers of medical and biological educational institutions, researchers, doctors of various specialties interested in immunology and allergology.