The Ohio Reformatory for Women is keeping about three dozen prisoners away from the rest because of an illness.
Officials at the prison tell 10TV News that 37 women from the same dormitory are showing symptoms of a stomach flu.
The prison moved them all to the same housing unit after consulting with the Union County Health Department.
It's also restricting movement for any other women who might have been exposed.
That includes keeping them in their units for meals instead of letting them go to the cafeteria.