Norovirus was the main contaminant driving the illnesses, the study found. People carry this virus and they can pass it on if they don't wash their hands after using the toilet or vomiting and before handling food, Griffin said.
"It's a reminder that it's important for everybody who handles food both in restaurants and at home to wash your hands well before handling food," Griffin said.
Consumers should also make sure they wash leafy greens, such as lettuce, well before eating them, added Mary Ann Scharf, an associate professor in the Seton Hall University College of Nursing in South Orange, N.J.
Meat needs to be kept refrigerated and then cooked thoroughly before it is eaten, she added.
Make sure that any knives or cutting boards that have come into contact with poultry are thoroughly washed before they come into contact with fresh vegetables or other food, Scharf advised.
More information
The U.S Centers for Disease Control and Prevention has more about food safety.
SOURCES: Patricia Griffin, M.D., chief, enteric diseases epidemiology branch, U.S. Centers for Disease Control and Prevention; Mary Ann Scharf, R.N., associate professor, Seton Hall University College of Nursing, South Orange, N.J.; March 2013 Emerging Infectious Diseases
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