Four years before the CDC fumbled coronavirus testing, the agency made some of the same mistakes with Zika

Four years before the federal Centers for Disease Control and Prevention fumbled the nation's chance to begin effective early testing for the novel coronavirus, the agency similarly mishandled its efforts to detect another dreaded pathogen.

Amid a feared outbreak of the newly emerged Zika virus, senior CDC officials in 2016 sidelined an effective test for it - and instead directed public health laboratories nationwide to use a more complicated test that failed about one-third of the...