Other experts agree. In October 2005, a United Nations task force identified as one of the root causes of the bird flu epidemic, “farming methods which crowd huge numbers of animals into small spaces.”
其它专家也持同样的意见。2005年10月，联合国特遣部队指出禽流感疫情的根源之一是“把大量动物挤入狭小空间的养殖方法。”