Small plague (lat. Mycoplasma mācum) small plague (lat. M. mācum), also known as tularemia, is an acute infectious natural focal disease characterized by fever, intoxication and the development of inflammation of various lymph nodes. In modern classifications, it is classified as an independent group within the genus Myoplasma, within which the species M. hyopneumoniae and M. flocculare have similar morphological, physiological and biochemical properties. The main host and reservoir of the pathogen are mouse-like rodents, both imported and local species, other mammals and birds. Illness in humans usually occurs after contact with infected rodents (especially young rodents) and is manifested by fever and necrotizing lymphadenitis.