The FDA also said it had begun looking at jalapeno peppers as a possible cause of the outbreak, as well as ingredients used to make salsa such as cilantro and Serrano peppers. Tomatoes continue to be investigated as well, spokeswoman Stephanie Kwisnek said.
On Tuesday, the government said it would test numerous other kinds of fresh produce commonly served with fresh tomatoes while insisting that tomatoes remained the leading culprit.
Investigators with the Centers for Disease Control and Prevention have interviewed people sickened in June to find out what they ate and to compare their diets with those of healthy relatives and neighbors. Officials so far have not revealed early findings, except to say they supported the investigation's new move.
Among the possibilities FDA has said it was exploring is whether tomatoes and other produce are sharing a common packing or shipping site where both might become contaminated, or whether multiple foods might be tainted while being grown on adjoining farms or with common water sources.
Officials have said some patients have told the Centers for Disease Control and Prevention they ate raw tomatoes in fresh salsa and guacamole.
CDC spokesman Glen Nowak said Saturday that the agency's scientists are working around the clock to try to pinpoint the source of the outbreak but are not ready to single out anything. Salsa ingredients, including peppers, are among the items being tested, Nowak said. "We don't rank the items we're looking at."
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