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As for consumers, Dr. Hamburg had some practical advice: Reject over-easy eggs. She said that as federal investigators continue their work with the companies involved, consumers should strictly avoid “runny egg yolks for mopping up with toast.”

The number of salmonella-related illnesses, which can be life-threatening, especially to those with weakened immune systems, is expected to increase. The most common symptoms are diarrhea, abdominal cramps and fever eight to 72 hours after eating a contaminated product.

Dr. Hamburg appeared Monday on ABC’s “Good Morning America,” CBS’ “The Early Show” and NBC’s “Today” show.