Congenital neutropenia-combined immunodeficiency due to MKL1 deficiency

Definition

A rare primary immunodeficieny due to a defect in innate immunity characterized by infantile-onset severe, recurrent bacterial infections. Patients may present with septic shock, meningitis, progressive and severe pneumonia (mostly associated with Pseudomonas infection), malignant otitis media, cutaneous and subcutaneous abscesses and poor wound healing. Severe impairment in neutrophil phagocytosis/migration are reported in all patients. Mild thrombocytopenia can also be present.