看国外 | 最新研究:非瘟病毒可在越洋运输中存活30天

看国外 2019-10-10 09:41:01

African Swine Fever virus can survive a simulated 30-day transoceanic voyage in contaminated plant-based feed and ingredients, a new study shows.


The study, conducted by veterinary researchers in the United States, looked at the degradation of African Swine Fever (ASF) virus in animal feed ingredients to understand the potential for disease spread through contaminated feed. The study was published in the journal Emerging Infectious Diseases.


ASF virus on a 30-day transoceanic voyage


The paper examined the possible risk of ASF virus spreading to the United States through imported feed. The study provides more accurate half-life measurements that confirm the virus can survive a simulated 30-day transoceanic voyage in contaminated plant-based feed and ingredients.



Research showed that ASF virus could in theory survive a month on a ship. Photo: Shutterstock


Lead author of the scientific article was assistant professor Megan Niederwerder, Kansas State University. In an article on the website of Kansas State Uni she commented, “This study provides additional evidence supporting the potential risk that feed may play in the transboundary movement of ASF. Our latest work provides robust half-life estimates, which include standard errors and confidence intervals, and characterises the stages of viral decay over time for ASF virus in animal feed ingredients.”

这篇科学论文的主要作者是堪萨斯州立大学的助理教授梅根·尼德韦尔德(Megan Niederwerder)。在堪萨斯州立大学网站上的一篇文章中,她评论道:“这项研究提供了额外的证据,证明饲料可能在非洲猪瘟的跨境运输中发挥潜在的风险。我们最新的工作提供了可靠的半衰期估计,其中包括标准误差和置信区间,并描述了动物饲料成分非瘟病毒随时间衰减的阶段。”

Total viable virus concentration


Detailed analysis shows that the half-life of ASF virus in feed ranges from 9.6 to 14.2 days after exposure to varying temperature and humidity conditions simulating transoceanic shipment. This means it would take about 2 weeks for the total viable virus concentration to decay by half its original count under the conditions of a transatlantic voyage. Dr Niederwerder said that all feed matrices provided a more supportive environment for viral stability when compared to media, where the shortest half-life was calculated.

详细分析表明,模拟越洋运输条件下,饲料中非瘟病毒的半衰期为9.6 ~ 14.2天。这意味着在跨大西洋航行的情况下,存活病毒的总浓度大约需要两周的时间才会减少一半。尼德韦尔德博士说,与用于计算最短半衰期的培养基相比,所有饲料基质为病毒稳定性提供了更有利的环境。

The new study expands on Dr Niederwerder’s earlier work and can be used to implement science-based management practices such as storage time to reduce this risk.


She said, “Transmission of swine viruses through feed has been recognised as a risk since around 2013, but the probability of ASF virus infection through plant-based feed was unknown until our publication earlier this year. Our research reports novel data and important quantitative information that can be incorporated into risk models for introduction and mitigation of ASF virus through imported feed ingredients.”


Infections in the Philippines and East Timor


Over the last months, ASF virus has not only emerged in Asia, but also shown capable of hopping to the Philippines as well as East Timor. Theoretically, North America can also be reached.


Dr Niederwerder said, “ASF virus is a rapidly spreading and emerging transboundary animal disease that threatens pork production and human food security worldwide. The emerging threat of ASF virus being introduced into the United States is staggering and significant efforts are focused on preventing entry.”


The research in Emerging Infectious Diseases was authored by Assistant Prof Megan Niederwerder, Ana Stoian, Trevor Hefley and Prof Bob Rowland, Kansas State University; Prof Jeff Zimmerman and Ju Ji, Iowa State University; Scott Dee, Pipestone Veterinary Services; and Diego Diel, Cornell University College.

这项关于新发传染病的研究由堪萨斯州立大学助理教授梅根·尼德韦尔德(Megan Niederwerder)、安娜·斯托安(Ana Stoian)、特雷弗·赫夫利(Trevor Hefley)和鲍勃·罗兰教授撰写;杰夫·齐默曼教授(Prof Jeff Zimmerman)和爱荷华州立大学朱吉、兽医服务公司斯科特•迪(Scott Dee);以及康奈尔大学的迭戈·迪尔(Diego Diel)。



文章来源:Pig Progress