Any idea how long hand, foot and mouth disease is contagious? DS had a fever last Tuesday or Wednesday, first bumps on his face on Wednesday, lots of bumps Thursday, blisters on hands, feet and mouth starting Friday morning. Pedi diagnosed, but was vague as to how long he will be contagious. We let our sitter know, but not sure how long to tell her to stay away. She's a college kid who has been sitting for us for the summer, and goes back to school the middle of next week. She, understandably, doesn't want to get this right as she is going back to school, but I really need her as much as possible this week. For today, she is helping out with DD while DS goes to Grandma's house. How long until you guys think she can be around DS? FWIW, she was exposed to him last Wed and Thurs, before we knew what he had.