亚洲免费av电影一区二区三区,日韩爱爱视频,51精品视频一区二区三区,91视频爱爱,日韩欧美在线播放视频,中文字幕少妇AV,亚洲电影中文字幕,久久久久亚洲av成人网址,久久综合视频网站,国产在线不卡免费播放

        ?

        Animal Disease Control: Challenges and Perspectives

        2020-06-01 01:54:36HuanchunChen
        Engineering 2020年1期

        Huanchun Chen

        a State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, China

        b Hubei Cooperative Innovation Center for Sustainable Pig Production, Wuhan 430070, China

        c Key Laboratory of Preventive Medicine in Hubei Province, Wuhan 430070, China

        Due to more and more frequent long-distance travel and international transactions, outbreaks and spread of animal diseases are significantly increasing around the world, causing enormous losses in animal husbandry and threat to human health, public hygiene, and food safety; sometimes even affecting ecological security.

        Viruses, bacteria, and parasites are the three main infectious factors causing animal diseases. Viral diseases such as African Swine Fever, which is still rampant in parts of Europe and Asia, have a catastrophic impact on the pig breeding industry,resulting in numerous pig mortalities, a sharp reduction in hog stock,and a spike in pork prices.Meanwhile,viral pathogens—such as porcine coronavirus, porcine reproductive and respiratory syndrome virus, Newcastle disease virus, hand-foot-and-mouth disease virus, and influenza virus—accumulate genetic mutations frequently. Intensive immune challenges have accelerated the development of new mutant strains that can better evade hosts’immune surveillance, leading to frequent failure of immune protection.

        Due to the multiple serotypes of bacterial pathogens such as

        Streptococcus suis, Haemophilus parasuis, Actinobacillus pleuropneumoniae, Avian paragallinarum, and Escherichia coli, the prevention of these animal diseases is extremely problematic.Furthermore, with increasing drug resistance of zoonotic bacteria,including Tubercle bacillus, Escherichia coli, and Salmonella, the cure of these animal diseases becomes more difficult.

        In terms of parasitic diseases,coccidiosis causes great economic losses to the poultry and rabbit breeding industries.Echinococcosis also acts as a huge threat to cattle and sheep breeding and to the health of herdsmen in pastoral areas. The prevention of parasitic diseases through vaccination is still in its infancy, and very few parasitic vaccines are commercially available. Moreover, drug resistance presents a major hindrance to the cure of parasitic diseases.

        To solve the problems described above, fundamental breakthroughs are desperately needed in the intervention of animal diseases.It is necessary to strengthen etiological and epidemiological studies on animal pathogens and the mechanisms of host-pathogen interaction.Efforts should be made to screen new drug targets and develop new products in disease prevention and control, such as novel vaccines,diagnostic agents,and medicines.Ultimately,we need to rely more on environmentally friendly measures, and less on vaccines and medicines.

        This special issue on animal diseases aims to enhance international academic communication on the prevention and control of animal diseases through both basic and applied research.We hope that the work reported herein will help to elevate the prophylaxis of animal diseases and promote the sustainable development of husbandry worldwide.

        欧美日韩另类视频| 疯狂做受xxxx国产| 国产高颜值大学生情侣酒店| 欧美在线日韩| 国产内射视频免费观看| 日本精品视频免费观看| 少妇人妻陈艳和黑人教练| 精品久久久久一区二区国产| 亚洲一区二区三区在线更新| 女色av少妇一区二区三区| 免费无遮挡禁18污污网站| 午夜一级成人| 久久久99精品国产片| 久久精品网站免费观看| 无码av免费精品一区二区三区 | 一个人午夜观看在线中文字幕 | 成人av在线免费播放| 国模gogo无码人体啪啪| 国产香蕉尹人在线观看视频| 免费国产h视频在线观看86| 亚洲精彩av大片在线观看| 门卫又粗又大又长好爽| 欧美做受视频播放| 久久伊人网久久伊人网| 国产一区二区视频免费在线观看 | 四虎成人精品无码永久在线| 成人免费丝袜美腿视频| 亚洲不卡高清av网站| 人人爽人人澡人人人妻| 久久中国国产Av秘 入口| 亚洲中文字幕一区av| 欧美人妻aⅴ中文字幕| 成人国产精品999视频| 在线日本高清日本免费| 本道天堂成在人线av无码免费 | 四川老熟女下面又黑又肥 | 国产亚洲精品久久久久婷婷瑜伽 | 久久久久亚洲av无码专区首jn | 日韩女优中文字幕在线| 婷婷久久国产综合精品| 明星性猛交ⅹxxx乱大交|