Since the fungus spores are produced daily, I would change and wash the bedding daily as well. Keep them confined to that one area and then keep that area scrupulously clean. Wear the disposable latex gloves you can get at a pharmacy and limit access to the area until the infestation is gone. Keep cleaning regularly even after that to ensure you get all of the spores that you can.
Washing their bedding daily is a chore in itself. Our washer is 1/2 the size of a normal one and it takes three hours to do one load of laundry but their health means more to me than anything so I am off to rewash their blankies.