Objective  To analyze the epidemiological characteristics of 208 clustered outbreaks of brucellosis (brucellosis) in Shaanxi Province, providing a basis and strategy for brucellosis prevention and control.

Methods  Descriptive epidemiological methods were used to analyze the data on the investigation and disposal of 208 cluster outbreaks of brucellosis reported in Shaanxi Province from 2020 to 2022.

Results  208 clustered outbreaks of brucellosis involved 596 individuals who tested positive for brucellosis serology, with 23 clustered outbreaks turning into outbreaks.The clustered outbreaks of brucellosis were mainly reported in July, and reported in the 64 counties. The gender ratio was 1.92:1, with the highest proportion of people aged 45−65 (56.88%), and the majority of occupations were farmers (86.74%). The main occurrence sites were cattle and sheep breeders (farms), accounting for 94.23%, which were mainly free range breeders (59.39%), followed by large-scale breeding farms (21.32%). The case relationship was mainly based on family members(77.88%). The time intervals between the onset, treatment, and diagnosis of cases were close to 90 days. The transmission routes of the epidemic were mainly through direct skin and mucous membrane contact and respiratory tract (72.12%). 118 cases of epidemic transmission can be traced, with a total of 25586 livestock detected, finally 1534 livestock were found to be positive. 6319 serum samples were collected from the exposed population, of which 179 were positive. 33.65% of clustered outbreaks of brucellosis were carried out disinfection of breeding and living environments.

Conclusion The clustered outbreaks of brucellosis in Shaanxi Province is widely distributed, mainly occurring in sheep free range households, which is difficult to trace and investigate the source of the epidemic., And awareness of seeking medical treatment for cases is weak. So disease control agencies at all levels in Shaanxi Province should work together with animal husbandry departments to carry out brucellosis epidemic investigation and disposal work, livestock must strengthen the supervision of positive livestock, and peole must pay attention to the improvement of clinical medical staff's brucellosis diagnosis and treatment level and awareness of seeking medical treatment for breeders.