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The therapeutic method of reverse isolation in patients using an aseptic environment in the Life Island or Laminar Air Flow Unit apparatus systems is described on the basis of data from the literature and the authors' experience. A historical summary of views on treatment in an aseptic environment is followed by a description of the method of work with the system of reverse isolation, including important technical, operational and other data. The main indications for treatment are given and the authors' experience with the reverse isolation of 36 patients suffering from blood diseases who were treated in this way over the past four years is evaluated. The experience gained confirms data from the literature that reverse isolation is unequivocally successful in reducing the number of infections in immunologically weakened persons. Other aspects have not yet been definitely assessed.

During a diagnostic collection, leukaemic blood was applied intramuscularly to a nurse. She has been in full clinical health for more than two years. The reported accidents or intentional attempts at human leukaemia transmission are discussed and it is concluded that until now human leukaemia has not been transmitted by any way.

The case of a 20-year-old woman with systemic mastocytosis is reported. The disorder was not preceded by a clinically diagnosed local form of the disease; fibrous changes in organs, bone changes, eosinophilia and increased serotonin, heparin or histamine levels had not been observed. Clinical symptomatology was typical and the patient died one year after the first signs of the disease.