Objective  To understand the cause of an outbreak of brucellosis in Dalad banner of Inner Mongolia, and suggest prevention and control measures.

  Methods  Epidemiological survey and laboratory test were conducted for the brucellosis outbreak in a natural village in Dalad in April 2020.

  Results  Three human brucellosis cases were reported in the village from 28 February to 5 March 2020,the epidemiological survey in April found another 4 confirmed cases and 3 unapparent infection cases. and the strains of Br melitensis 1 and 3 were detected. All the patients were traced, recorded and treated, key populations were monitored, terminal spray disinfections were conducted for people living environment and livestock sheds, face to face health education was conducted for the villagers and protective materials were provided by local health sector. Strict livestock quarantine and sick animal weeding out and animal epidemic surveillance were conducted by local animal husbandry and veterinary sector.

  Conclusion  The outbreak was related with the importation of sick livestock without quarantine, resulting in human infection. It is necessary to strengthen the strengthen the disease surveillance, management in sheep and sick animal weeding out, interrupt infection source and strengthen the joint prevention and control by health sector and animal husbandry and veterinary sector.