I'm Dr Chaithanya, experienced General Physician attending you today.
Sorry for your son's condition.
Now, the rejection of the graft happens when someone else's organ is transplanted to our body. This is because the recipient body cells and immune cells treat the new lung that is transplanted as foreign material and try to work against them.
The rejection of transplant can be mild, moderate, and severe. Your son has moderate rejection. Steroids are given to suppress the immune reaction that is shown against the new transplant.
It is exactly not known how long each can show rejection phase, and how well they cope up.
He will most probably get back to normal soon.
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