**complications** - infection - viral -- influenzae, RSV, *CMV pneumonia* - bacterial -- S pneumo, S aureus, klebsiella, haemophilus - fungal -- aspirgillus, candida, pneumocystis jiroveci (PJP rare if on prophylaxis) - mycobacterium -→ hyperammonemia syndrome within 2 weeks of post-transplantation - check ammonia in any lung transplant patient with ALOC - Rejection eg chronic allograft dysfunction