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Medicines may contain pyrogens, the sources of which can be bacteria, viruses, fungi, and pyrogens can also be by-products of the production process. Contamination of drugs with pyrogenic substances is a serious threat to the health of patients and can lead to the development of fever and, ultimately, shock and death. Currently, to determine the content of pyrogenic substances (bacterial endotoxins and substances of non-endotoxin nature), the “Pyrogenicity” test is used, carried out on rabbits, which is inaccurate and harmful to animals. The monocyte activation test (MAT) has higher sensitivity and does not require the use of animals.