over use of antibiotics causes drug resistant strains to emerge. natural selection at its best.
http://www.cdc.gov/narms/animals.html
http://evolution.berkeley.edu/evolibrary/news/130501_superbugs
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Deadly superbug arrives in US
According to the Centers for Disease Control and Prevention (CDC), infections with CRE germs are very difficult to treat. One report suggests they may contribute to death in up to 50 percent of infected patients.
At the National Press Club in Washington on Thursday, CDC director Tom Frieden called CRE a “nightmare bacteria.â€
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