Although scientific evidence indicates that ASFV is very resilient in the environment, especially in infected pig tissues and meat products, and can survive in some feed ingredients if they become contaminated with the virus, the major unknown is the extent of ASFV contamination and its viability in feed ingredients because there is no global or national feed diagnostic or surveillance systems, argue the researchers in that paper.
The authors are all based at the University of Minnesota.
Because of the unknown prevalence and infectivity of ASFV in feed supply chains, the US feed and pork industry, in particular, and the North American feed industry, in general, has adopted a proactive and a more risk-averse approach to scrutinizing countries of origin of some types of feed ingredients.
However, the reviewers, including Professor Gerald Shurson from the Department of Animal Science at that US university, say that using a more holistic approach to evaluating the relative risks of ASFV contamination in feed supply chains may be helpful for understanding critical control points for developing biosecurity programs to prevent the introduction of ASFV into North America and other countries that are currently free of the virus.
We ran a Q&A with Prof Shurson to find out more.
FeedNavigator: What is a holistic approach to evaluating relative risks of ASFV contamination in feed supply chains?
Gerald Shurson: Simply showing that ASFV can survive in a specific feed ingredient does not infer anything about the likelihood of contamination or capability of the virus in causing infection if a contaminated ingredient is fed to pigs. Several previous published 'risk assessment' studies have suggested that feed may serve as a potential source of ASFV transmission without indicating that there are differences among types of feed ingredients or providing the level of uncertainty in the assessment. For example, ASFV has been shown to survive for a significant period of time when artificially inoculated in soybean meal, but no studies have been conducted to evaluate whether ASFV survives in grains or other oilseed meals. Does this mean that we should not wonder about ASFV survival in corn or wheat or rapeseed meal if a source becomes contaminated? I think not, but the point is that we need to think more broadly about potential hazards for each type of feed ingredient being imported and used in swine feeds.
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July 27, 2021 at 09:04PM
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What approach is needed to prevent the entry of ASF into North America and other markets? - FeedNavigator.com
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