Sometimes, resistance doesn't just "happen", but
happens for specific reasons. Pure happenstance 
that Scientific American ran an article on a 
subject discussed on Bee-L

"Antibiotic Resistance: Blame It on Lifesaving Malaria Drug?"

"Resistance to ciprofloxacin (Cipro) has emerged in people
without access to the antibiotic, but who have taken a 
related antimalarial..."

http://tinyurl.com/6c4f32

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