Table 5.

Aggregate single‐unit risks in transfused RBC under current donor testing protocols in the United States

Aggregate risk category	Risk elementsa	Risk
Minimum	• HIV + HCV+ HBV • Bacteria • Babesia‐nonendemic area	0.00031% (1 in 322,600)
Minimum + CMVb	• HIV + HCV+ HBV • Bacteria • CMV risk for immunocompromised patients • Babesia‐nonendemic area	0.10031% (1 in 996)
Maximum	• HIV + HCV+ HBV • Bacteria • Babesia‐endemic area • New chronic EIA	0.12031% (1 in 831)
Maximum CMVb	• HIV + HCV+ HBV • Bacteria • CMV risk for immunocompromised patients • Babesia‐endemic area • New chronic EIA	0.22031% (1 in 454)

^aThis column contains the components that are then summed together to provide the total risk (shown in the right‐hand column), for each aggregate risk category. The numbers for each risk element are taken from Table 4.

^b(HSCT patients).