Nearly 50 people who recently arrived in Minnesota from the Ebola outbreak zone in western Africa are now being monitored by the state Health Department.

The department says besides those 48 people, it is trying to reach 12 others who will be included in the monitoring program.

The program was recently implemented in an effort to quickly deal with any suspected cases and limit the possible spread of the deadly virus. The monitoring period is 21 days, the incubation period of Ebola. So far, no cases have been confirmed in Minnesota.

Mayo Clinic’s St. Mary’s Hospital is one of four health care centers in the state designated as an Ebola treatment facility.