Targeted screening in states with the highest seroprevalence of infection is likely to exceed an implicit threshold of $1 million/QALY often used in blood safety. However, the proportion of donor-seronegative parasitemia, transmissibility, and clinical outcomes resulting from TTB are uncertain.

This patient had the third documented transfusion case caused by B. duncani. His case underscores the fact that babesiosis can be caused by agents not detected by molecular or serologic analyses for B. microti.