Epidemiological investigation of a brucellosis outbreak in Dalian city, Liaoning province, 2021

  Objective   To investigate the causes and epidemic characteristics of an outbreak of brucellosis in a sheep soup restaurant in Dalian city.To provide suggestions for brucellosis epidemic prevention and control and prevention of similar events.

  Methods  Carried out field epidemiological investigation and collected blood sample for tube agglutination test. Descriptive epidemiological method was used to analyze the case investigation and experimental results.

  Results  After investigation, a total of six cases and three latent infection cases were found. The onset of the case was from August 11 to October 2 in 2021, and represented a homologous outbreak pattern. The main clinical manifestations of the cases were fever,muscle and joint pain,fatigue,etc. Five cases were engaged in kitchen work, and one had helped slaughter and dispose of sick sheep.processed diseased mutton and ate uncooked mutton were suspected exposure factors.

  Conclusion  This was an outbreak of human brucellosis in Dalian caused by processing diseased mutton and esting uncooked mutton with bacteria. it is necessary to strengthen the publicity and education of professional people and raise the awareness of protection to control and reduce the epidemic of brucellosis.