[Autoimmune-alloimmune neonatal neutropenia. Serum reactive IgG and neutrophil-specific phenotype detected by flow cytometry].

Auto or alloantibodies reactive with neutrophils define immune neutropenia. Alloimmune neonatal neutropenia is caused by maternal sensitization to paternal neutrophil antigens, resulting in IgG antibodies that are transferred to the fetus through the placenta. We present the studies in 4 children from 3 families with neutropenia of unknown origin (two of them were brothers).