Minnesota Health Department

National Infant Immunization Week starts Saturday, and it's taken on a special significance for Minnesota health officials this year. Kristen Ehresmann, director of infectious diseases for the state health department, points out that it's happening at the same time as a measles outbreak that grew to 21 confirmed cases as of Thursday.

The Minnesota Health Department reports the number of serious medical mistakes in Minnesota hospitals held steady last year, which disappointed some experts.