Animal pathogens cause many diseases of economic importance to U.S. livestock and poultry industries. Some of the most closely watched animal diseases, include: mad cow disease, brucellosis, leptospirosis, and porcine reproductive and respiratory syndrome. These and other pathogens may also contaminate foods and otherwise endanger human health.
United States Department of Agriculture
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Science Daily. May 29, 2008.
Ships are inadvertently carrying trillions of stoways in their ballast water tanks. When pumped out, invasive species could be released into new environments, where disease-causing microbes pose new risks to public health.