The number of ill persons identified in each state with this strain is as follows: AK (1), AL (2), AZ (5), CA (30), CO (4), CT (4), DC (1), DE (2), FL (3), GA (3), IA (1), ID (2), IL (13), IN (3), KS (3), LA (1), MA (12), MD (1), ME (1), MI (4), MN (5), MO (1), NC (9), ND (1), NE (1), NH (1), NJ (8), NM (2), NY (18), OH (9), OK (1), OR (9), PA (6), RI (2), SC (1), SD (3), TN (5), TX (7), UT (9), VA (1), WA (15), WV (1), and WY (2). Because this is a commonly occurring strain, public health investigators may determine that some of the illnesses are not part of this outbreak.
Among the persons with reported dates available, illnesses began between July 4, 2009 and January 21, 2010. Infected individuals range in age from < 1 year old to 93 years old and the median age is 37 years. Fifty-three percent of patients are male. Among the 159 patients with available information, 42 (26%) were hospitalized.