It’s been an unprecedented year for the Centers for Disease Control and Prevention (CDC), as America’s public health agency continues its emergency response to the most complex Ebola epidemic in history. Ebola, however, is far from the only critical mission CDC undertook in 2014.

The Centers for Disease Control and Prevention (CDC) announced yesterday that public health authorities will begin active post-arrival monitoring of travelers whose travel originates in Liberia, Sierra Leone, or Guinea.