“…2-6 Nevertheless, we were able to confirm that the cryoprecipitates used by us in the 1980s protected our patients from HIV infection. 5 However, protection from HIV infection was not achieved by inactivation of the virus or by other technical means but was a consequence of the prevailing epidemiology at that time. Because in the GDR the population groups who were blood donors were almost totally excluded from traveling, spread of HIV was limited to a few isolated cases.…”