[Screening for HIV-1 antibodies in recipients of potentially HIV infected preserved blood].

On 7/1/85 the screening of HIV-1-antibody as marker of HIV infectivity of blood has been introduced in our institute. Since then 76,244 donations have been screened. 15 of long-term donors proved to be seropositive. All their blood preparations before seropositivity were traced back for at least 2 years. The look back of the infectivity of these components is given in the table. The conclusion seems warranted that safety of blood transfusion has clearly improved. The time-interval of seronegative but infectious donations of later seropositive donors, however, remains to be determined.