i have 4 kids and when one gets it usaly only that one gets it and ill tell u how i do that to some this may seem exstream but i do have a phobia of v but when that one child is sick they have to stay in there room keep in mind that child has a tv n toys in there room we have 2bathrooms n the sick one uses the sick bathroom and we use the other the child in the room cant come out untill v and d stop and then i lysol bomb the room bleach bed sheets and bleach and lysol the sick room i also wash my hands often and use latex gloves to clean the sick bathroom and bed room.my kids r 16,12,9 and 3 and this worked everytime one got sick never failed hope this helps