Microorganisms

The U.S. Public Health Service has identified the following microorganisms as being the biggest culprits of foodborne illness, either because of the severity of the sickness or the number of cases of illness they cause. Beware of these pathogens: Fight BAC! Information and graphics provided by Fight Bac

Most common bacterial cause of diarrhea in the United States; Sources: raw and undercooked meat and poultry, raw milk and untreated water

This organism produces a toxin which causes botulism, a life-threatening illness that can prevent the breathing muscles from moving air in and out of the lungs. Sources: home-prepared foods and herbal oils; honey should not be fed to children less than 12 months old

A bacterium that can produce a deadly toxin and causes approximately 73,000 cases of foodborne illness each year in the U.S.; Sources: meat, especially undercooked or raw hamburger, produce and raw milk

Causes listeriosis, a serious disease for pregnant women, newborns and adults with a weakened immune system; Sources: soil and water. It has been found in dairy products including soft cheeses as well as in raw and undercooked meat, in poultry and seafood, and in produce

This virus is the leading cause of diarrhea in the United States. Any food can be contaminated with norovirus if handled by someone who is infected with this virus.

Most common cause of foodborne deaths. Responsible for millions of cases of foodborne illness a year; Sources: raw and undercooked eggs, undercooked poultry and meat, dairy products, seafood, fruits and vegetables

This bacterium produces a toxin that causes vomiting shortly after ingesting; Sources: cooked foods high in protein (e.g. cooked ham, salads, bakery products, dairy products)

Causes an estimated 300,000 cases of diarrhea illnesses. Poor hygiene causes Shigella to be easily passed from person to person. Sources: salads, milk and dairy products, and unclean water.

A parasite that causes toxoplasmosis, a very severe disease that can produce central nervous system disorders particularly mental retardation and visual impairment in children. Pregnant women and people with weakened immune systems are at higher risk; Sources: meat, primarily pork

Causes gastroenteritis or a syndrome known as primary septicemia. People with liver diseases are especially at high risk; Sources: raw or undercooked seafood.