The toll from salmonella-tainted tomatoes has jumped to 228 illnesses. The government has learned of five dozen previously unknown cases, and says it's possible the food poisoning contributed to the death of a cancer patient in Texas.

Six states that had escaped the outbreak so far have been added to the list, Florida, Georgia, Missouri, New York, Tennessee and Vermont, bringing the number of affected states to 23.

The Food and Drug Administration still hasn't pinpointed the source of the outbreak. And with the latest known illness striking on June 1, officials also aren't sure if all the tainted tomatoes are off the market.