KENOSHA, Wis. - A 26-year-old health care worker who had a flu shot has died after complications of the flu.

WISN-TV first reported the death of Katherine McQuestion, of Kenosha, who was a radiology technician at St. Catherine's Medical Center in Pleasant Prairie.

Kenosha County Health Office Cynthia Johnson confirmed on Saturday that McQuestion had sepsis, which led to a heart attack. A funeral home obituary lists McQuestion's death as Jan. 2, with a funeral Tuesday.

Johnson says most people are still helped by the flu shot, despite this year's vaccine being poorly matched to the dominant strains in circulation.

Johnson says in 2014 the county had 139 flu cases, most in December. She says they had 57 cases in 2013 and 34 in 2012.