I have a sow that has had 4 weeks treatment with her previous owner and 3 treatments with me, her hair where it was bald is now covering the skin(when I got her there was no hair growth and the skin was scabby) and all scabs have gone. I have also treated her friend who hadn't been done by prev owner. Am I ok to assume she is now over the infection, or do I need to quarantine for longer?