[Epidemiological analysis on the rising of brucellosis prevalence in the area already under controlled]

An epidemiological analysis was made on the outbreak of brucellosis in Sui-de County, Shaanxi Province in 1995-1996. Result showed that it was one of the most serious brucellosis outbreaks since 1986 when national brucellosis under controlled critiria had been met in the province, and the number of cases was continuously spreading and growing. The incidence was up to 84.8 per 10(5) and the prevalence rate reached 17.5 percent. Patients had typical symptoms with bad conditions. Most all the cases were those who had vocations such as shepherds, etc. Patients' antibody titers were very high with the highest one approached 1:25,600. Two strains of B. melitensis, type III were isolated from the blood of patients.