An investigation of the first brucellosis outbreak in human in Bijie City of Guizhou Province

Abstract

Objective This study was designed to investigate the infection sources and transmission range of the first brucellosis outbreak in human in Bijie City in order to take specific control measures. Methods Fangzhu Town of Qixingguan District was selected as the investigation site where the first medical case was reported. ①Basic conditions investigation: the population and the livestock conditions were investigated; ②Specific investigation: remote specific investigation of the first case was made through telephone by using unified specific investigation form; ③ Epidemic situation in human: based on the rule of informed consent, serum samples of all sheep raising people were collected for examination; ④Epidemic situation in livestock: sheep's serum samples were collected by agricultural sector. Rose-bengal plate agglutination test (RBPT) and standard agglutination test (SAT) were used to test the serum samples. Results There were 6 338 households with 28 682 residents in Fangzhu County totally, including 70 households feeding 2 184 herds of sheep. The first case had attacked on May 10th, 2014, who was transferred to the first people's hospital of Yunnan Province on July 17th, 2014, and was diagnosed as brucellosis on July 25th, 2014. There were 85 serum specimens from livestock feeders tested totally, 17 specimens showed SAT positive, 10 cases were confirmed, recessive infection were 7 cases, the infection rate was 20.00% (17/85), the detection rate was 11.76% (10/85), and the recessive infection rate was 8.24% (7/85). A total of 339 sheep serum samples were tested, 133 specimens showed RBPT positive. The positive rate was 39.23% (133/339). Conclusion Brucellosis epidemic was exisited in Bijie City among human and animals, and the situations of infection is serious. The prevention and control of brucellosis should be publicity and education on the sheep flocks. Key words: Brucellosis; Outbreak; Control