<prompt> Neonate with recurrent infection and abscess diagnosed of kostmann syndrome. Treatment include:Antithymocyte globulin cyclosporineAntithymocyte globulin cyclosporine GM -CSFG-CSFGM-CSF  <response>: Kostmann syndrome is severe neutropenia with maturation defect in the marrow progenitor cells. Recombinant G-CSF will increase neutrophil counts in most patients. The dose should be regulated to keep the absolute neutrophil count below 10,000L. Ref: Ambruso D.R., Hays T., Goldenberg N.A., Nuss R. 2012. Chapter 30. Hematologic Disorders. In W.W. Hay, Jr., M.J. Levin, R.R. Deterding, J.J. Ross, J.M. Sondheimer Eds, CURRENT Diagnosis Treatment: Pediatrics, 21e. 