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A fungus called Cryptococcus gattii can cause life-threatening infections, especially in people with compromised immune systems. One-third of AIDS-related deaths are thought to be caused by the fungus. But though people in Southern California have been getting sick from C. gatti for years, nobody knew how.... C. gattii from three trees, Canary Island pine, New Zealand pohutukawa and American sweet gum, matched almost exactly with C. gattii from infected patients. And the tree samples matched not just those from recent patients but from people who were sick 10 to 12 years ago. Thus this strain of C. gattii has been...

A deadly, airborne new strain of fungus has emerged in Oregon. It has killed nearly one out of four known affected people so far and might also attack animals ranging from dogs to dolphins. And it is likely to spread, researchers now warn. The new strain known as VGIIc of the fungus Cryptococcus gattii not only targets humans but has also proven capable of infecting dogs, cats, alpacas, sheep and elk. Other strains have even infected porpoises. Although it can spread to mammals, it does not jump from animal to animal. Instead, people and other animals get it from inhaling...

A potentially deadly strain of fungus is spreading among animals and people in the northwestern United States and the Canadian province of British Columbia, researchers reported on Thursday. The airborne fungus, called Cryptococcus gattii, usually only infects transplant and AIDS patients and people with otherwise compromised immune systems, but the new strain is genetically different, the researchers said. "This novel fungus is worrisome because it appears to be a threat to otherwise healthy people," said Edmond Byrnes of Duke University in North Carolina, who led the study. "The findings presented here document that the outbreak of C. gattii in Western...