I have a sixteen year old daughter who got up yesterday feeling really wimpy with a soar throat and a headache. Early afternoon she ran a low grade fever and was really complaining about her throat...when I check she had red spots along with a couple of blisters in the back roof of her mouth and in her throat. This morning she has no fever, but her chest and stomach are covered in a fine pick rash. The blister in her mouth has popped and appears to be healing. Her throat is very sore. I m assuming this is some kind of a virus that will need to run it s course...I m worried she may be contagious. We care for a three month old baby during the day...do you know what the usual incubation period is on viral infections?