E. coli reduction in cattle is possible, but economics are debated

Two approaches could dramatically reduce the presence of E. coli O157:H7 from cattle, though who should foot the bill is cause for debate. One option is Pfizer's three-series vaccine that has shown E. coli elimination in 85% of vaccinated cattle, while the other option, probiotics, when given in the right amounts, can reduce E. coli up to 50%.

http://www.usatoday.com/money/industries/food/story/2011-12-01/safe-meat/51447546/1

Lethal virus threatens salmon supply for humans and animals

 Infectious salmon anemia, a virulent and highly contagious virus that decimated 70% of salmon stock on affected farms in other countries, has been documented in salmon on North America's West Coast. Scientists are concerned about the salmon supply for wild animals, such as grizzly bears, killer whales and wolves, and for humans because offshore pens supply most of the Atlantic salmon for human consumption in the U.S.

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