My son takes 20mg a day broken us as 10mg on waking, 5mg at lunch and 5mg at tea time. We are noticing that on days when he is exerting himself he is becoming exhausted before the tea time dose so we may need to tweak things a little with that. But, he has not had a chest infection since February!!! For almost 18 months before it was almost constant!
How much Hydrocortisone does your son take??
My son has been on hydrocortisone for adrenal insufficiency for just over 6 months. We were informed about immunosuppression and that we had to inform anyone who took bloods from him about the steroids as it messes with some, not all, tests.
To be honest tho, my son has never been healthier than he is at the moment.