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Table 1 Relative Risk of the most frequent TTI

From: Transfusion-transmitted infections

Risk factor/infectious agent   Risk of TTI in blood products released Ref.
   U.S. Europe  
Virus     
HIV   1 in 2,135,000 1 in 909,000 – 5,500,000 26, 30, 33
HCV   1 in 1,930,000 1 in 2,00,000 – 4,400,000 26, 30, 33
HBV   1 in 277,000 1 in 72,000 – 1,100,000* 33
WNV   1 in 350,000 No reported cases 56, 63
HTLV-II   1 in 2,993,000 Not tested 30
Bacteria     
Bacterial contamination RBC 1 in 38,500 8, 10
  Platelets 1 in 5,000 13
Parasites     
Malaria   1 in 1,000,000 – 5,000,000   105
  1. * High variations between low-endemic areas and intermediate-endemic areas