My son (9) tested positive for flu type a on tuesday. we are currently on day 4 and still experiencing high fever (103 without medication, 101.4 with medication). is this to be expected and how many days are too many if fever continues?

If he is still eating and generally himself I would wait and not worry. It is not the fever that is bad; it is the process that is causing fever that could be bad. Encourage rest and adequate fluid intake that may be increased because of the fever. It is a good sign if the peak of the fever is going down and he is not specific about other problems like chest pain or ear pain.