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Taco Bell and its parent Yum Brands (YUM) haven’t had a few good days. Last week, customers in the Northeast came down with E. coli. At first health officials thought the source was green onions which made the faux-Mexican restaurant chain to toss out their nationwide supply. Now, further tests find green onions weren’t the source. To make things worse the Washington Post reports:

Meanwhile, nearly three dozen people have fallen ill with symptoms consistent with E. coli infection after eating at a Taco John’s restaurant in Cedar Falls, Iowa.

YUM stock has taken a 6% hit since the news came out. Uncertainly of the E. coli source won’t help it.

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