The number of ill persons identified in each state is as follows: Alabama (2), Arizona (12), Arkansas (5), California (74), Colorado (13), Connecticut (9), Georgia (6), Hawaii (4), Idaho (15), Illinois (6), Indiana (7), Iowa (3), Kansas (2), Kentucky (3), Maine (4), Maryland (8), Massachusetts (47), Michigan (30), Minnesota (36), Missouri (12), Mississippi (6), Nebraska (1), New Hampshire (11), New Jersey (23), New York (22), Nevada (6), North Carolina (6), North Dakota (13), Ohio (80), Oklahoma (2), Oregon (11), Pennsylvania (17), Rhode Island (4), South Dakota (4), Tennessee (11), Texas (6), Utah (5), Vermont (4), Virginia (21), Washington (17), West Virginia (2), Wisconsin (3), and Wyoming (2). Additionally, one ill person was reported from Canada.

Among the persons with confirmed, reported dates available, illnesses began between September 1, 2008 and January 22, 2009. Patients range in age from <1 to 98 years. The median age of patients is 16 years which means that half of ill persons are younger than 16 years. 21% are age <5 years, 15% are >59 years. 48% of patients are female. Among persons with available information, 22% reported being hospitalized. Infection may have contributed to eight deaths: Idaho (1), Minnesota (3), North Carolina (1), Ohio (1), and Virginia (2).