Transmission of Human Immunodeficiency Virus (HIV) by Blood Transfusions Screened as Negative for HIV Antibody

Abstract
Since early 1985, blood donations in the United States have been screened for antibody to human immunodeficiency virus (HIV). To identify instances of HIV transmission by antibody-negative donations, we investigated 13 persons seropositive for HIV who had received blood from 7 donors who were screened as negative for HIV antibody at the time of donation.