最新研究：非瘟病毒可在越洋运输中存活30天

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

一份新研究显示，在受污染的植物源饲料及原料的越洋运输中，非洲猪瘟病毒可以存活30天。

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.

这项由美国兽医研究人员进行的研究观察了非洲猪瘟（ASF）病毒在动物饲料成分中的降解情况，以了解通过受污染饲料传播疾病的可能性。这项研究发表在《新发传染病》杂志上。

ASF virus on a 30-day transoceanic voyage

30天海洋运输中的非瘟病毒

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.

这篇论文调查了非瘟病毒通过进口饲料传播到美国的可能风险。这项研究提供了更准确的半衰期测量数据，证实这种病毒可以在受污染的植物性饲料和原料中，在模拟的30天越洋航行中存活。

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

研究表明，非洲猪瘟病毒理论上可以在海洋运输中存活一个月。图：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

活病毒总浓度

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.

这项新的研究扩展了尼德韦尔德博士早期的工作，可以用于实施科学管理实践，如存储时间，以减少这种风险。

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.”

她说：“自2013年左右开始，通过饲料传播猪瘟病毒就被视作一种风险，但直到我们今年早些时候发表文章之前，通过植物性饲料传播非瘟病毒的可能性还是未知的。我们的研究报告了新的数据和重要的定量信息，可以纳入进口饲料成分引入和减轻非瘟病毒的风险模型。”

Infections in the Philippines and East Timor

菲律宾及东帝汶的非瘟感染情况

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.

在过去的几个月里，非瘟病毒不仅在亚洲出现，而且传播到菲律宾和东帝汶。理论上讲，也可以来到北美。

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.”

尼德韦尔德博士说：“非瘟病毒是一种迅速蔓延和新兴的跨境动物疾病，威胁着全球猪肉生产和人类食品安全。非瘟病毒可能引入美国带来的威胁是惊人的，努力集中在防止其进入。”

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.

原文链接：

https://www.pigprogress.net/Health/Articles/2019/10/ASF-can-survive-a-30-day-transoceanic-voyage-480932E/

（注明：翻译来自于爱猪网记者刘坤颖编译）