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People pass walk by a Chipotle Restaurant  in Manhattan on September 11, 2015 in New York. Chipotle's 1,850 restaurants spent September 9, 2015 in a cram effort to hire 4,000 new workers to staff a rapid expansion, as it adds 200 more outlets this year. Built on a pitch of fresh, organic and locally sourced ingredients for its burrito wraps and tacos, the thriving US chain is making clear it is not ready to ease up on expansion plans.  AFP PHOTO/KENA BETANCUR        (Photo credit should read KENA BETANCUR/AFP/Getty Images)
People pass walk by a Chipotle Restaurant  in Manhattan on September 11, 2015 in New York. Chipotle's 1,850 restaurants spent September 9, 2015 in a cram effort to hire 4,000 new workers to staff a rapid expansion, as it adds 200 more outlets this year. Built on a pitch of fresh, organic and locally sourced ingredients for its burrito wraps and tacos, the thriving US chain is making clear it is not ready to ease up on expansion plans.  AFP PHOTO/KENA BETANCUR        (Photo credit should read KENA BETANCUR/AFP/Getty Images)

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Chipotle's stock tanks over food safety concerns

CNN's Richard Quest and CNN Money correspondent Cristina Alesci discusses Chipotle's food safety issues.

Chipotle's stock tanks over food safety concerns

CNN's Richard Quest and CNN Money correspondent Cristina Alesci discusses Chipotle's food safety issues.