CMV at this stage of Transplant is less likely since immunosuppression
is at minimum at this stage ( assuming it was reduced to minimum dosages). Besides, CMV IgM is not a good test to detect CMV infection
after the transplant. Granted that, it is a good test before the transplant.
Would suggest to see Gastro-enterologist at the same hospital as your Nephrologist
The rise in creatinine could be because of dehydration
which can be confirmed on clinical exam only and once confirmed, should improve with intravenous fluid infusions.