My son who just turned 2 on 1/9/11 began running a fever last Thurs 1/20/11. On Monday he awoke with Sores on his chin. Tuesday 1/25/11 the doctor diagnosed him with hand mouth and foot disease. I was told he d have the fever for about a week. His fever hasn t been over 102 degrees, but it is Saturday 1/29 and he is still running a fever on & off. At times he s back to his old self and then his nose begins to run and the fever returns. When should I be worried? Should I take him to the ER? I haven t taken him, because I don t want him being priked and probed and then told its just a virus . I have a daughter, who is 9 month and she caught the virus, she also has the mouth sores , but hasn t had fever as frequent as her brother. I have disinfected the house, sprayed lysol, cleaned, kept them apart, constant hand washing, I have even arranged for someone to come to the house to care for them, while I m working until they get better. I am kind of worried, but am not sure if I should be. Please help.