Daughter is at university and there's been a mumps outbreak. A boy in her flat has it and is staying at uni and not going home. She is going to get a booster immunisation tomorrow at the medical centre. Then is coming home for the weekend. Will she be immediately covered. I have read it has a 14 - 25 day incubation period so she could already be infected. Is there a chance she could pass it on to us and our other children at home?