An additional infusion of the donor cell does not necessarily require any additional pre-conditioning. Here's one study reflecting that.
http://www.ncbi.nlm.nih.gov/pubmed/11279309
I'm not certain I understand how BT is causing pneumonia? Of all the cell lines, red cells tend to be the easiest one to tolerate. Why are they continuing to treat him as a an inpatient? Even if he's getting BT daily, that can be managed as an outpatient. Patients seem to do better out of the hospital than in especially after such a long stay. I'm sure there's more to his story though.
I would seek another opinion. Maybe post in the transplant section of this site and ask people for recommendations. Where is he being treated at now? You may need to travel to a different center.
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Marlene, wife to John DX w/SAA April 2002, Stable partial remission; Treated with High Dose Cytoxan, Johns Hopkins, June 2002. Final phlebotomy 11/2016. As of July 2021 HGB 12.0, WBC 4.70/ANC 3.85, Plts 110K.
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