IgA/IgM Enriched Immunoglobulin Therapy for Recurrent Pulmonary Infections in a Patient With Partial IgA Deficiency and Lung Transplantation

A 57-year-old man with partial selective IgA deficiency (normal IgM, IgG, and IgG subclass levels; normal T and B lymphocyte counts; vaccine challenge not performed) underwent bilateral lung transplantation in March 2022 for progressive fibrosing interstitial lung disease, classified as probable hypersensitivity pneumonitis, without an identifiable cause.He had no prior history of immunosuppressive therapy.