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May 17, 2019


African Swine Fever (ASF)

Between September 2018 and May 2019, the number of
African swine fever (ASF) outbreaks has rapidly increased,
most notably in China, triggering economic losses in
affected pork-producing countries (Figure 1). Since
September 2018, the World Organization for Animal Health
(OIE)-an intergovernmental organization coordinating,
supporting, and promoting animal health and disease
control-has reported that over 2.8 million hogs have been
culled globally due to ASF. Many industry observers
believe that the actual number of culled animals is much
higher. The extent of ASF outbreaks is expected to affect
international trade in pork and feedstuffs. The U.S.
Department of Agriculture's (USDA) Animal and Plant
Health Inspection Service (APHIS) is monitoring the global
spread of ASF and has developed plans to prevent ASF
introduction into the United States.

Background
ASF is a viral disease that affects swine, including domestic
pigs, feral (wild) swine, wild boar, and other exotic swine.
Infected swine may exhibit symptoms including high fever,
decreased appetite, and weakness. ASF leads to nearly
100% mortality rates in swine herds. There is no treatment
or vaccine available for ASF. The only way to reduce the
prevalence of ASF is to quarantine and depopulate (cull) all
affected and exposed animals. ASF does not have zoonotic
potential-the infection cannot spread from animals to
humans.
ASF is caused by the African swine fever virus and spreads
between pigs by direct contact with an infected animal, its
bodily fluids (e.g., saliva, blood, feces), or animal tissue or
through indirect contact with contaminated objects. In
addition, it is often introduced into a herd through the


feeding of garbage. On-farm biosecurity is critical to
preventing ASF from developing and spreading.
ASF Impacts on Global Pork Trade
China, the world's leader in pork production, has notified
OIE of animal losses due to ASF. Between September 2018
and May 2019, China has reported over 2 million culled
animals. The USDA's Foreign Agricultural Service's
Livestock and Poultry: World Markets and Trade report
for April 2019 forecasts that China's pork imports in 2019
will climb to a record high, partly due to liquidation of
China's swine herd. Despite efforts to contain the disease,
outbreaks continue to emerge, and it appears that China will
be unable to eradicate ASF in the near term. Chinese pork
imports could partially offset its lower production, and the
EU, Canada, Brazil, and United States are expected to
increase exports to China.
Because of ASF, USDA reports that U.S. pork sales to
China from January to April 2019 are more than three times
higher than during the same period a year ago in spite of the
retaliatory tariffs China imposed on U.S. pork exports in
April 2018. Higher Chinese imports will likely create an
uptick in global pork trade in 2019, driving global hog
prices up and leading to record sales for exporters, such as
the United States.

In contrast, China is also the world's leading importer of
soybeans-a source for high-protein meal used as animal
feed-averaging over 90 million metric tons per year since
2016, according to USDA. A substantial decline in China's
hog population could curb its soybean imports.


Figure I. Global Distribution of ASF (January 201 7-May 2019)


Source: OlE, World Animal Health Information Database, accessed May 15, 2019.


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