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| Blood donor test | Risk of infection per number of transfused units |
|---|---|
| HBV | 1:800,000 to 1:1,200,000 |
| HCV | 1:1,100,000 |
| HIV | 1:1,500,000 |
| WNV | Very rare; two cases reported 2008–2014 |
| HTVL | 1:641,000 |
| Chagas | Very low, no cases since screening has been implemented (FDA, 2010) |
| Syphilis | Very low, no cases in last 40 years |
| Bacterial contamination of platelets | 1:3000 |
