Brucellosis
2.1. Brucellosis is an acute infectious-allergic, zoonotic disease with a high potential for progression to a chronic form.
2.2. The causative agent of brucellosis belongs to the genus Brucella (II group of pathogenicity). Brucellae are gram-negative, facultative intracellular pathogens causing the disease in a large number of animals and humans. The genus Brucella consists of 9 distinct species differing in biochemical, metabolic, antigenic, and virulence characteristics: B. melitensis is represented by three biovars, the main host being goats and sheep, B. abortus comprises seven biovars (cattle), B. suis consists of five biovars, with pigs as the primary host; two biovars are carried by rabbits, four biovars by deer, and five by rodents; B. neotomae (desert woodrats), B. ovis (sheep), B. canis (dogs), B. ceti (cetaceans), B. pinnipedialis (pinnipeds), B. microti (common voles). The main epidemiological and epizootic problems related to brucellosis are determined by the carriers of three main species of the pathogen (B. melitensis, B. abortus, B. suis) - farm animals
Source: Order of the Chief State Sanitary Doctor of Russia dated 26.04.2010 No. 39 "On Approval of SP 3.1.7.2613-10" (together with "SP 3.1.7.2613-10. Prevention of Brucellosis. Sanitary and Epidemiological Rules") (Registered by the Ministry of Justice of Russia on 02.06.2010 No. 17435)