[jyl]

I think the company and the various agencies are all over the investigation, which is why it is so interesting that they haven't found the cause.

Sounds like all the fresh food prep done in the restaurants (which will change) increases the risk of an individual restaurant having problems. But i think (please correct me if I'm wrong) the first outbreak is all a single problem, because the E Coli was all one strain in all the cases from many different restaurants. And the second outbreak is another single problem, since all those cases from different restaurants involved another E Coli strain.