This is a factor that must be considered when tracking the spread of the disease. The comments below about bird flu are instructive.
Locating large chicken farms near cities might make economic sense, but the close concentration of the birds to densely populated areas can help foster and spread disease, Nierenberg says. In Laos, 42 of the 45 outbreaks of avian flu in the spring of 2004 occurred on factory farms, and 38 were in the capital, Vientiane (the few small farms in the city where outbreaks occurred were located close to commercial operations). In Nigeria, the first cases of avian flu were found in an industrial broiler operation; it spread from that 46,000-bird farm to 30 other factory farms, then quickly to neighboring backyard flocks, forcing already-poor farmers to kill their chickens.
Due mainly to the spread of avian flu and the culling of birds, global poultry output rose only slightly in 2006 to approximately 83 million tons, roughly a 1-percent decrease from the preceding year. Pig meat production, however, grew by 3 percent to 108 million tons, an increase likely due to shifting consumption in Asia from chicken to pork due to concerns about avian flu.
Avian flu has existed among backyard flocks for centuries, but has never been found to evolve there into highly pathogenic forms such as the deadly H5N1 virus. In CAFOs, in contrast, where animals are concentrated by the thousands, diseases erupt and spread quickly. Trade in poultry from these operations is a culprit in spreading the disease to smallholder farmers.
New Meat Byproducts: Avian Flu and Global Climate Change | Worldwatch Institute.
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