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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