<s>[INST] My 13 yr old son started running a low grade fever about 2 wks ago. Went to dr; got amoxicillin. Fever lasted 6 days. Seemed okay for the next 7 days, then the same thing started again. On day 3 now. Dr prescribed antibiotic #2. should he have bloodwork done to determine if this is even an infection? Thanks! [/INST] Hello no  need to worry .recurrent lo w grafe fever that lasted for 5-7 days indicates only that he has low immunity thats why he is catching infection  early.no need to investigate </s>