Leukocyte Adhesion Deficiency Type 1 with Low Expression of CD 11b.

Leukocyte adhesion deficiency type 1 (LAD-1) is a rare autosomal recessive disorder caused by mutations in the gene that codes for CD18, the beta chain of beta-2 integrins, located on the long arm of chromosome 21. This defect results in failure of leukocyte migration to the site of infection due to the absence of surface integrins. Leukocyte adhesion deficiency should be suspected in any patient with recurrent infections, impaired wound healing, history of delayed umbilical cord separation, periodontitis, leukocytosis, recurrent soft tissue and oral infections. Diagnosis is based on the analysis of neutrophils for the surface expression of CD18, CD11a, CD11b and CD11c by flow cytometry. Here, we present a 55-day male infant with umbilical cord separation on the 10th day of life and no history of infection, who was identified with LAD-1 with low expression of CD11b. The purpose of performing LAD flow cytometric analysis in this patient was to screen him for LAD-1 as his elder brother had LAD-1 and one elder sister died undiagnosed with recurrent skin and chest infections at 8 months of age.