“If you get a [H5 or H7] virus into a high-density poultry operation and give it a period of time, generally a year or so, then you turn that virus into a highly virulent virus. That’s what always happens….”
2005 Canada’s National Manager of Disease Control within the Food Inspection Agency seems to agree: “Just passing the virus to 3,000 or 4,000 chickens is enough to change a harmless virus into something more pathogenic.”
5006 “It is high-density chicken farming that gives rise to highly-virulent influenza viruses,” Brown concluded. “That’s pretty clear.”
2007
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