There are 5 types of deadly food poisonings. Listeria, E. coli, Salmonella, Staph bacteria and Hepatitis A. While listeriosis, the disease caused by the bacteria Listeria, is less common than some other kinds of food-borne illness and the numbers of people affected are much smaller overall, it's by far the most deadly. There are several strains of E. Coli, and one of these, E. coli O157:H7, is much more dangerous than the others.
Tests of meat on grocery store shelves this spring revealed high levels of staph bacteria - the kind of bacteria that causes skin and respiratory infections. Hepatitis A ever reported in the U.S. claiming more than 660 victims including four fatalities came from green onions served at a Chi-Chi's restaurant in Pennsylvania.