The Oakland County Health Department announced at a news conference Friday afternoon that they have confirmed a case of measles in an adult in that county.

State and county officials say a Stevens County resident has tested positive for measles and that they don’t yet know if the infection is linked to outbreaks elsewhere in the country. The Kansas Department of Health and Environment and Stevens County Health Department reported the infection Thursday.

The Texas health department reported 259 measles cases in the state on Friday, an increase of 36 cases from its previous count on March 11, as one of the largest outbreaks the U.S. has seen in the last decade spreads.