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Volume 25, Number 12—December 2019
Dispatch

Half-Life of African Swine Fever Virus in Shipped Feed

Ana M.M. Stoian, Jeff Zimmerman, Ju Ji, Trevor J. Hefley, Scott Dee, Diego G. Diel, Raymond R.R. Rowland, and Megan C. NiederwerderComments to Author 
Author affiliations: Kansas State University, Manhattan, Kansas, USA (A.M.M. Stoian, T.J. Hefley, R.R.R. Rowland, M.C. Niederwerder); Iowa State University, Ames, Iowa, USA (J. Zimmerman, J. Ji); Pipestone Applied Research, Pipestone, Minnesota, USA (S. Dee); Cornell University, Ithaca, New York, USA (D.G. Diel)

Main Article

Table

Half-life of African swine fever virus Georgia 2007 in animal feed ingredients subjected to temperature and humidity conditions simulating a 30-d transoceanic shipment*

Feed or feed ingredient Mean titer on day 30† Half-life ± SE 95% CI for half-life estimates Previous titer on day 30 (5,10)† Previous half-life estimates (5,10)
Soybean meal (conventional) 103.0 9.6 ± 0.4 8.7–10.4 103.0 4.6
Soybean meal (organic) 103.0 12.9 ± 0.6 11.5–14.3 103.1 4.7
Soy oil cake 103.1 12.4 ± 0.9 10.4–14.3 103.2 5.0
Choline 103.2 11.9 ± 0.5 10.9–12.9 103.2 5.1
Moist cat food 103.0 10.6 ± 0.5 9.5–11.7 103.0 4.6
Moist dog food 102.8 11.7 ± 0.4 10.8–12.6 102.8 4.2
Dry dog food 102.7 13.1 ± 0.4 12.3–14.0 102.8 4.1
Pork sausage casings 102.9 13.1 ± 0.7 11.6–14.6 102.9 4.4
Complete feed 102.7 14.2 ± 0.8 12.4–15.9 102.9 4.3
RPMI medium Not determined 8.3 ± 0.3 7.7–9.0 103.0 4.7

*Values listed in days unless otherwise indicated. Feed ingredient selection based on use in swine feed or volume of ingredient imported into the United States from China each year (5). Samples subjected to temperature (mean 12.3°C) and relative humidity (mean 74.1%) conditions in an environmental chamber programed to simulate transoceanic shipment. Complete feed samples were in meal form.
†Mean titer of duplicate samples listed as 50% tissue culture infective dose.

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References
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Page updated: November 18, 2019
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