The Hidden Link Between Factory Farms and Human Illness
(Page 2 of 8)
February/March 2009
By Laura Sayre
The situation is akin to that surrounding global climate change four or five years ago: near-universal scientific consensus matched by government inaction and media inattention. Although the specter of pandemic flu — in which a virulent strain of the influenza virus recombines with a highly contagious strain to create a bug rivaling that responsible for the 1918 flu pandemic, thought to have killed as many as 50 million people — is the most dire scenario, antibiotic resistance is a clear and present danger, already killing thousands of people in the United States each year.
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People, Animals and Microbes
From one perspective, picking up bugs from our domesticated animals is nothing new. Approximately two-thirds of the 1,400 known human pathogens are thought to have originated in animals: Scientists think tuberculosis and the common cold probably came to us from cattle; pertussis from pigs or sheep; leprosy from water buffalo; influenza from ducks.
Most of these ailments probably appeared relatively early in the 10,000-year-old history of animal domestication. Over time, some human populations developed immunity to these diseases; others were eventually controlled with vaccines.
Some continued to kill humans until the mid-20th century discovery of penicillin, a miracle drug that rendered formerly life-threatening infections relatively harmless. Other antibiotics followed, until by the 1960s leading researchers and public health officials were declaring that the war on infectious diseases had been won.
Beginning in the mid 1970s, however, the numbers of deaths from infectious diseases in the United States started to go back up. Some were from old nemeses, such as tuberculosis, newly resistant to standard antibiotic treatments; others were wholly novel.
“In recent decades,” writes Dr. Michael Greger, director of public health and animal agriculture for the Humane Society of the United States and author of Bird Flu: A Virus of Our Own Hatching, “previously unknown diseases have surfaced at a pace unheard of in the recorded annals of medicine: more than 30 newly identified human pathogens in 30 years, most of them newly discovered zoonotic viruses.” (Zoonotic viruses are those that can be passed from animals to humans.)
Why is this happening? There are many reasons, including the increased pace of international travel and human incursions into wild animals’ habitats. But one factor stands out: the rise of industrial farm animal production. “Factory farms represent the most significant change in the lives of animals in 10,000 years,” Greger writes. “This is not how animals were supposed to live.”
Chicken and pig production are particularly bad. In 1965, the total U.S. hog population numbered 53 million, spread over more than 1 million pig farms in the United States — most of them small family operations. Today, we have 65 million hogs on just 65,640 farms nationwide. Many of these “farms” — 2,538, to be exact — have upwards of 5,000 hogs on the premises at any given time. Broiler chicken production rose from 366 million in 1945 to 8,400 million in 2001, most of them in facilities housing tens of thousands of birds.
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