The U.S. Food and Drug Administration has created the position of assistant commissioner for food protection, which will be assumed by Dr. David Acheson.
Imported ingredients for human food will be inspected for contamination as part of the U.S. Food and Drug administration's probe into tainted pet food.
Taco Bell removed green onions from its U.S. restaurants after tests showed a "presumptive positive" but federal officials are questioning the results.
U.S. officials have known for years that new food handling regulations were needed and recent E.coli outbreaks may result in changes, The New York Times said.
Food safety experts said the E. coli bacteria found in irrigation water in Salinas, Calif., appears to be unconnected to the recent spinach outbreak.
The U.S. Food and Drug Administration has lifted its warning on most fresh spinach, saying the alert now covers only brands packaged on certain dates.
U.S. officials have limited a warning against eating fresh spinach to spinach produced in three California counties linked to a nationwide E. coli outbreak.
The search for the source of the 146 cases of E. coli infection from spinach in 23 U.S. states has been narrowed to a single region in California.
U.S. health officials say an outbreak of E.coli infection linked to raw spinach from California has caused 131 cases of illness in 21 states.
The number of people affected by E. coli bacteria from eating California spinach rose to 109 Monday, with one death reported in Wisconsin.