A contagious, fatal illness in deer, elk and moose has taken hold in the US and is now reaching other countries. While it has not infected humans yet, the risk is growing

In a scattershot pattern that now extends from coast to coast, continental US states have been announcing new hotspots of chronic wasting disease (CWD).

The contagious and always-fatal neurodegenerative disorder infects the cervid family that includes deer, elk, moose and, in higher latitudes, reindeer. There is no vaccine or treatment.