[Chronic XXXX possibly caused by a plasma factor].

@entity1 @entity281 @entity1398 @entity236
In this article two @entity1 are reported with recurrent upper airways and @entity281 . Laboratory investigation showed a persistent @entity1398 . The @entity236 showed a normal cellularity of the erythroid series and the megakaryocytes. The myeloid series were normal with a decreased number of mature segmented neutrophils. In these patients the serum levels of immunoglobulins were within normal range and antibodies against the white cells could not be demonstrated. By the age of 2-3 years the recurrence of @entity281 had decreased and @entity281 of importance have not been reported since. By that age the peripheral white count was not abnormal. This combination of signs and symptoms is known as 'chronic @entity1398 '. The etiology is obscure. Our investigation in one case (by that time recovered) showed a diminished growth of the myeloid series of donor bone marrow in the presence of patient's serum. This suggests a plasma-factor responsible for the maturation of the myeloid series. This finding has not yet been reported in the literature.
