Healthy animals are fed low doses of antibiotics over long periods of time, creating the ideal breeding ground for bacteria to become resistant.

One study estimates that in 2005 MRSA (methicillin-resistant Staphylococcus aureus), a particularly severe bacterial infection that is resistant to antibiotics, caused over 18,000 deaths in the United States--a mortality level greater than that of HIV/AIDS...

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Source: www.streetinsider.com