<p>Shelves sit empty of Blue Bell ice cream at a grocery store in Dallas, Tuesday.</p>
April 22, 2015
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April 22, 2015 9 p.m.
Blue Bell still trying to pinpoint listeria cause
HOUSTON - A massive recall has brought more attention and put more pressure on a century-old Texas ice cream company that has been searching to discover how its products became linked to a deadly string of listeria cases.