论文部分内容阅读
近几乍来,在一些地区布鲁菌氏病(简称布病)疫情回升,人畜间感染率增高,爆发点也屡有发生。这是一个值得注意的倾向。本文介绍当前可能引起布病流行的几个主要因素。一、易感家畜增多,畜群免疫水平较低布病疫情和家畜数量、畜群免疫水平有一定关系。过去布病流行比较严重的地区如牧区、半农半牧区及部分农区,由于传染后免疫、在自然状态下长期反复接受抗原刺激或预防接种等原因,畜群多有一定的免疫力,因此,近些年来布病在这些地区多为散在发生,感染后呈隐性经过,没有明显的临床症状。其它一些布病疫情一贯较轻的地区如城镇和一些农区,由于家畜较少,感染率较低,虽未全面开展布病防治工作,但若无新的传染源传入等原因,也很少出现爆发和流行。
In recent years, in some areas, the outbreak of brucellosis (referred to as brucellosis) has risen, and the infection rate between people and animals has increased. The outbreaks have also occurred frequently. This is a noteworthy tendencies. This article describes the current main factors that may have caused the epidemic of brucellosis. First, an increase in susceptible livestock, lower level of herd immunity Cloth and disease outbreaks and the number of livestock, herd immunity levels have a certain relationship. In past areas where brucellosis was more serious, such as pastoral areas, semi-agricultural and semi-pastoral areas and some agricultural areas, herds had some immunity due to repeated post-infection antigen inoculation or vaccination in natural conditions due to post-infection immunity In recent years, brucellosis is mostly scattered in these areas. After infection, there is no obvious clinical symptom. Some other areas where the brucellosis epidemic has always been lighter, such as urban areas and some agricultural areas, do not fully carry out brucellosis prevention and control because of fewer domestic animals and low infection rates. However, if there is no new source of infection, Less outbreaks and epidemics.