We did not find a significant increase of microbiologically documented Gram-positive (RR 1.71; CI 95% 0.90–3.28), Gram-negative (RR 1.56 CI 95% 0.90–2.69), virus (RR 1.50 CI 95% 0.69–3.24) or fungal infections (RR 1.00 CI 95% 0.03–2.66) in patients whose donors had low-producer MBL2 genotypes (AO and OO genotypes). The gene discussed is MBL2; the disease is fungal infectious disease.