Report: Source of Okla. E. coli outbreak a mystery

(AP) -- An extensive investigation has failed to determine how E. coli bacteria was introduced into a northeastern Oklahoma restaurant linked to hundreds of illnesses and one death, the state health board said in a report released Thursday.

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<p><a href="http://www.physorg.com/news158516911.html">Report: Source of Okla. E. coli outbreak a mystery</a></p> <p>(AP) -- An extensive investigation has failed to determine how E. coli bacteria was introduced into a northeastern Oklahoma restaurant linked to hundreds of illnesses and one death, the state health board said in a report released Thursday.</p>