Abstract
In 1956 Rolf Kostmann reported on six children with severe neutropenia associated with a block in myelopoiesis at the promyelocyte/myelocyte stage and an autosomal recessive inheritance. He named the new syndrome infantile genetic agranulocytosis. Today it is known as Kostmann's syndrome or severe congenital neutropenia. In 1975 an additional 10 cases from northern Sweden were published. This article reports on the only long-term survivor from the 1975 report plus another five patients born after 1975 who belong to the original "Kostmann family". Treatment and survival have changed dramatically since Kostmann's first publication. In the pre-antibiotic era, Kostmann's syndrome was inevitably fatal during the first year of life.

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