Kansas reports measles outbreak with 23 cases as infections rise across U.S.

Kansas health officials have confirmed 23 measles cases, marking an outbreak for the state as infections in at least 17 states have led to the most cases in the U.S. in a single year since 2019. 

The Kansas outbreak is spread across 6 southwest counties, the state's Department of Health and Environment said Wednesday. 

The majority of cases, 20, are individuals who were not vaccinated against the infection. Fifteen cases are in school-aged children, between ages 5 and 17, six patients are 4 years old or younger and two are over 18, officials said.