YANKTON, S.D. (WNAX) – The debate continues over the use of face masks to slow the spread of the coronavirus.

Yankton Doctor Mike Pietila says masks can be very effective.

Pietila, the head of the Intensive Care Unit at Avera Sacred Heart Hospital, says they continue to get new information.

Pietila says people have to get their medical information from credible sources.

At least 22 states that have opened businesses and public spaces are seeing infection numbers rise.