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Animal and Plant Health Inspection Service
U.S. Department of Agriculture
USDA FAQ's and resources about coronavirus (COVID-19).  LEARN MORE
African Swine Fever: One Case Is Too Many
With a 100% mortality rate and no vaccine for pigs, African Swine Fever poses a grave threat to commercial producers. While the virus has not been detected in the United States, international travel, trade, and the disease’s easy transmission puts your herd at risk. It’s important to remain vigilant, practice and enforce proven prevention steps, and enhance your farm’s biosecurity plans and practices.

How Transmission Can Occur

Although people cannot get African swine fever, they can carry it on clothing, shoes, and equipment. Sources of the infection include garbage feeding, contaminated personnel, equipment and vehicles, contaminated feed, or water, infected domestic or wild pigs, soft ticks, stable flies and semen. The most common sources of transmission include:

group of pigs in a facility

pig head iconDirect contact occurs when healthy pigs have contact with infected domestic or wild swine or come in contact with infected saliva, urine, feces, or aerosolized respiratory secretions via coughing or sneezing.

pig eating iconIndirect transmission happens when healthy pigs eat virus-contaminated feed, pork products, or come into contact with the virus on clothing, shoes, equipment, vehicles, or food waste.

tick insect borne iconThis occurs when a soft tick acts as a vector, feeding on infected pigs and spreading the virus to healthy swine. Other insects like stable flies, leeches, and swine lice may also spread it.

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