Food and Drug Administration Commissioner Margaret Hamburg says there is no evidence that there are additional farms involved in a massive recall of more than half a billion eggs.
Officials also said Monday they do not expect the number of eggs recalled to grow based on what they know now. The Centers for Disease Control and Prevention said it has not identified additional clusters of illness that would indicate the outbreak has spread beyond two Iowa farms.
Also Monday, the House Energy and Commerce Committee said it is investigating the outbreak and sent letters to both farms asking for detailed information about company operations, communications with the government and what they knew when.