My grandson has been in the hospital since Tuesday Dec 29th. They have been focusing on Kawasaki infection and gave him igg treatment Sunday night. His fever went down to 98 but went back to 100.4 this afternoon. He lives Houston but was in Austin over the Christmas weekend. He got sick when they returned. His sisters are 6 and 4. They only suffered upset stomachs Friday morning Jan 1st. None of the blood test showed anything abnormal. Could he possibly have some sort of parasite?