500 million eggs have now been recalled.
The eggs were in stores in 17 different states, but originated from Iowa farms.
The recall occurred after over a thousand people became ill and some eggs tested positive for salmonella contamination.
Anyone that believes they may have salmonella poisoning should seek medical attention, although a quick recovery is likely, in some cases the bacteria can be life-threatening.
Abdominal cramps, diarrhea, vomiting, and fever that last for a few days are some of the symptoms.
Pregnant women, elderly, children, and anyone with a weak immune system are more likely to experience serious complications from salmonella poisoning.
The contaminated eggs were packaged between May and August from plant numbers 1026, 1413, 1663 1860, 1946 and Julian dates ranging from 099 to 230.
Plant numbers and Julian dates are stamped on the side of the egg cartons.
Wright Egg Farm and Hillandale Farms recalled their eggs and are being inspected by the Food and Drug Administration.
The eggs from both farms were sold under various brand names including Mountain Dairy, Sunshine, Kemps, Dutch Farms, Farm Fresh, Sun Meadow, and other names.
The possibly infected eggs made their way to Ohio, Texas, California, Wisconsin and many other states.
The two farms share a supplier for their young chickens and feed.
The source of the salmonella contamination is being investigated, but it may take up to a few months.
So far investigations have found that the owner of one of the farms in question has previously been cited for environmental violations and fined for health and safety violations.
Salmonella bacteria usually grows in unclean food or polluted water.
Rodent feces in the chicken feed is one possible cause.
Once a chicken is infected, the bacteria is passed to their eggs.
The egg recall is bringing up questions about regulations and revealing multiple problems.
Many people that ate contaminated eggs are filing law suits.