“…This has been demonstrated by several outbreaks of food borne illnesses, caused by Escherichia coli O157:H7 in the past, which have been linked to undercooked meat patties (Shilton et al, 2002;Zorilla and Singh, 2003;Oroszvári et al, 2005a). Therefore, the FDA (in 1997) and the USDA (in 1998) recommended that hamburger patties must be cooked to an internal temperature of 68.3 and 71°C, respectively, and held for 15 s (Erdogdu et al, 2005;Wang and Singh, 2004). On the other hand, overprocessing should be avoided because of its undesirable effects on flavour, texture and nutritive value of the product (Oroszvári et al, 2005a).…”