Cumulative incidence curves showing probability of reaching different hemagglutinin titer endpoints during 100 days after transplant in recipients of marrow from HLA-matched unrelated donors (MUD) in patients with or without acute GvHD.

(A, “IgG-undiluted”), days after transplant when IgG-hemagglutinins were only detectable in undiluted serum; (B, “IgM-undiluted”), days after transplant when IgM-hemagglutinins were only detectable in undiluted serum; (C, “IgG/IgM-nil”), days after transplant when IgG plus IgM-hemagglutinins were undetectable.