Paper titled Investigation of Possible Transmission of HIV by Blood Transfusion by Dr Patricia Hewitt. the Paper aimed to study the transmission of HIV by blood donated from individuals subsequently identified to be infected with HIV. Designed as a retrospective study of previous donations from individuals subsequently identified as infected with HIV. This includes the investigation of donations from individuals believed to have transmitted HIV infection by transfusion and investigations of donations transfused to recipients later found to be infected with HIV in whom the only identified risk for infection was blood transfusion. Twenty five donors identified as HIV positive from North London BTC were included in the study.