As of March 4, 2011, seven persons infected with the outbreak strain of E. coli serotype O157:H7 have been reported from Michigan (1 case), Minnesota (3 cases), and Wisconsin (3 cases). Reported dates of illness onset range from December 20, 2010 to January 28, 2011. Ill persons range in age from 15 to 78 years, with a median age of 62 years; 86% are male. Among ill persons, 43% reported being hospitalized, and none have reported hemolytic uremic syndrome, a type of kidney failure that is associated with E. coli O157:H7 infections. No deaths have been reported.