Earlier quoted context omitted.
And they've taken active steps to prevent it happening again.
Look at the graph of CMG compared to MCD or DPZ to see how convinced the market is by this. The Chipotle contamination incident was devastating.
I'm not suggesting that they weren't damaged by those incidents. 2016 data isn't in yet, but 2015 sales figures show them to be at least holding steady.
My point was that the company ultimately aggressively addressed the problem head-on and very well may have saved the company. The public has no long term memory. Let's compare notes in 2018.