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National Wildlife Disease Program (NWDP)

Feral Swine Disease Surveillance

NWDP is involved in disease management, research, disease surveillance, emergency response, education and outreach for diseases of feral swine. There are around 4 million feral swine in the United States today. These animals, weighing in at up to 400 lbs., are non-native to the US and are considered invasive. They can be reservoirs of disease and may act as a host to a number of parasites, leaving the United States domestic swine industry vulnerable to disease.

Known Feral Swine Diseases and Threats:

• pseudorabies*
• swine brucellosis*
• classical swine fever*
• African swine fever
• bovine tuberculosis
• influenza
• PRRS
• anthrax
• tularemia
• West Nile virus
E. coli
• salmonella
• trichinosis
• streptococcus
• ticks, fleas, lice
• internal parasites

Biologists take serum samples from a feral hog in Texas.

*Since 2006, NWDP has implemented disease monitoring programs for swine brucellosis, pseudorabies and classical swine fever across the nation.

In accordance with the Act of 1931; the Rural Development, Agriculture & Related Agencies Appropriations Act of 1988; and Homeland Security Presidential Directives 8 & 9; NWDP is committed to protecting domestic animals, wildlife and humans from a major zoonotic disease outbreak through an effective surveillance program.

Partners to WS in the surveillance of feral swine diseases:

• Federal Agencies
• State Wildlife Agencies
• Domestic Swine Industry
• Laboratories
• Universities
• Wildlife/Animal Health Organizations

More information on feral swine:

Disease Risks Associated With Increasing Feral Swine Numbers and Distribution in the United States (pdf, 964kb)
Brucellosis and Hog Hunters Brochure (pdf, 1.40mb)
Southestern Cooperative Wildlife Disease Study (SCWDS)/APHIS National Feral Swine Mapping System (see a frequently-updated map of US feral swine populations)
APHIS Publication: Feral Swine: Damage and Disease Threats (pdf, 184kb)

*Surveillance manuals available upon request

Project Manager:
Tom DeLiberto
Thomas.J.DeLiberto@aphis.usda.gov
(970) 266-6088
USDA/APHIS/WS
4101 Laporte Ave
Fort Collins, CO 80521






Additional Information