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Shiga toxin-producing E. coli (STEC) are diarrhea-causing strains of a group of bacteria called Escherichia coli. E. coli O157:H7 is the most well-known type of STEC, but there are many other types that can cause illness in humans. While STEC infection has traditionally been associated with animal products, outbreaks associated with produce have become more common.
Giardiasis is a parasitic intestinal disease that may result in asymptomatic infection; acute, self-limited diarrhea; or chronic intermittent symptoms. The disease is spread primarily from person to person through ingestion of infective cysts.
Listeriosis is caused by the bacterium Listeria monocytogenes. Infection results from ingestion of contaminated foods or from maternal transmission to the neonate. In high-risk individuals, listeriosis causes meningoencephalitis and/or septicemia.