My son is 21/2 years old, he had a fever for 3 days last week accompanied by a cough, and headache. Dr checked him out - said it was a virus, the fever cleared, but the cough has remained. My son has had a history of ear infections, so that is always my worry when he gets sick. I took him back to the doctor this past Monday - he was coughing a lot, but no fever, but hasn't been eating much. She said his lungs were clear, and that all looked ok and that his cough should resolve in a few days. Last night (Tuesday night) he came home from school with a low grade fever, still coughing and the fever has been fluctuating between 100.4 and 102. Can he have another virus?? Should i be worried?