A deadly fungal infection has been spreading across western North America. The number of human and animal cases has grown rapidly in recent years, to the extent that government agencies in US and Canada have labelled the infection an outbreak.
Cryptococcus gattii is an airborne fungus usually found in the tropics. But researchers announced today that new, deadly strains are thriving in Oregon, and spreading. These strains kill 25% of people who come into contact with them.