The textbook is intended for agricultural technical schools in the specialty "Veterinary medicine" . It consists of four sections .. The first section sets out the basics of general parasitology, which: are a prerequisite for the study of a special part. The following sections describe diseases of agricultural and commercial animals caused by helminths, insects, ticks and protozoa, as well as carriers of infectious diseases. Significant changes and additions have been made to the present edition, the material is more rationally located. The book additionally includes a number of parasitic animal diseases, describes the results of new experimental work on parasitology and achievements of advanced veterinary practice in the fight against invasive animal diseases, including birds. Largely updated illustrative material. All sections of the textbook are distinguished by a specific, clear and concise presentation of a large factual material .. The book can also serve as a manual for veterinary specialists.