This bill replaced S. 510, the original FDA Food Safety Modernization Act. On Sunday, December 19, the text of S. 510 replaced the original text of H.R. 2751, and the bill passed by voice vote. H.R. 2751, originally the Consumer Assistance to Recycle and Save Act, passed the House in June 2009 and was a "vehicle" for the passage of S. 510 in a House-originating bill because S. 510 was a revenue-raising bill. All revenue-raising bills must originate in the House.

http://www.govtrack.us/congress/billtex ... =h111-2751
H.R. 2751: FDA Food Safety Modernization Act
Signed by President Jan 4, 2011