Blue Bell says it's still trying to pinpoint listeria cause

Company recalls 8 million gallons of ice cream

A sign explains why shelves sit empty of Blue Bell ice cream at a grocery store in Dallas Tuesday. Texas-based Blue Bell Creameries issued a voluntary recall Monday, April 20, 2015, for all of its products on the market after two samples of chocolate chip cookie dough ice cream tested positive for Listeriosis. - photo by Associated Press

Blue Bell Web — A sign explains why shelves sit empty of Blue Bell ice cream at a grocery store in Dallas Tuesday. Texas-based Blue Bell Creameries issued a voluntary recall Monday, April 20, 2015, for all of its products on the market after two samples of chocolate chip cookie dough ice cream tested positive for Listeriosis. - photo by Associated Press

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. Blue Bell Creameries said Tuesday, a day after recalling all its products, that it is getting closer to pinpointing the cause of the contamination. Amid those efforts, the Centers for Disease Control and Prevention said Tuesday that the number of illnesses linked to the company's products has increased to 10.

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