The incredibly rapid adaptation of nucleic acid tests for West Nile virus (WNV), along with declining WNV incidence in many
parts of the United States, has allowed blood banks and patients to breathe much easier. However, in this issue, Custer and
colleagues provide a careful and circumspect cost-effectiveness analysis of WNV screening in blood banks. Their model shows
that from a population perspective, WNV testing is very costly relative to its benefits, which affect relatively few people.