my 4 year old son started with a cough, cold, fever and sore eyes about 5 1/2 weeks ago. He got antibiotics and has seemed pretty well in himself since. The cough tho has not gone away. Some weeks it has been only slightly troublesome but this week the snot has returned and the cough has stepped up a gear(keep running upatairs to him). He's being tested at the moment for a possible immune problem. Would you say it is normal for a cough to go on so long or is this dfinately not right and therefore a symptom of the immune problem? I have propped him up on loads of pillows and put a wet towel on the radiator. During the summer he was suffering allergies and wheezing, the doc gave us an inhaler which i have only used once since, would it be worth using now?