Serological Investigation for Brucellosis of Dairy Cows in Shihezi,Xinjiang
In order to grasp the prevention and control effect of dairy cows brucellosis in the past five years,from 2018 to 2022,different numbers of serum samples were inrandomly selected from 14 immune-scale cattle farms,5 non-immune-scale cattle farms and 22 non-immune free-range cattle farms(fixed farms)in 14 farms of XPCC every year for brucellosis antibody monitoring.A total of 919449 samples were collected in this survey,which were screened by tiger red plate agglutination test,and the positive samples were confirmed by tube agglutination test.The results showed that the individual positive rates of immune antibodies in immune scale cattle farms from 2018 to 2022 were 33.17%,46.55%,51.76%,57.27%and 59.12%,respectively.The positive rate of field group was 100%.There was no significant difference between the annual individual positive rate and the field group positive rate(P>0.05).The individual positive rates of non-immunized cattle farms were 2.21%,0.87%,0.70%,0.29%and 0.13%,respectively.The positive rate of field group was 20%～100%.The positive rate of individuals in each year showed a significant downward trend year by year(P<0.05).Non-immune free-range households 0.87%,0.72%,0.29%,0.08%,0.03%;the positive rate of field group was 9.09%～50%.The positive rate of individuals in each year showed a significant downward trend year by year(P<0.05).The results indicate that:It showed that the prevention,control and purification measures of brucellosis adopted by the Corps in the past five years were positive and effective.The overall prevalence rate decreased year by year,and the risk of large-scale epidemic was small.However,there are still some problems.First,some large-scale cattle farms continue to carry out brucellosis vaccine immunization.In addition,there is no effective clinical method to identify vaccine immune antibodies and wild virus infection antibodies,and it is impossible to correctly evaluate the effect of brucellosis prevention and control.Second,some positive sites have the risk of brucellosis transmission.Therefore,it is suggested that the immunization exit schedule should be formulated as soon as possible,and all cattle farms should implement'monitoring + culling'measures,strengthen quarantine supervision,strictly control animal movement,reduce the risk of spread,and further promote the purification of brucellosis.
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