The U.S. Food and Drug Administration commissioner on Monday said there may be more recalls of eggs in the salmonella outbreak and the agency did not yet know how the eggs and chickens were contaminated.

"We don't know exactly how the contamination got into the chicken population, into the egg population, and we're not yet fully sure the extent of the recall that will be necessary to protect consumers," FDA Commissioner Margaret Hamburg said on ABC's "Good Morning America."

"We are in the midst of probably the largest egg recall that has happened in recent history," she said.

Read more: Reuters

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