For the first time ever, researchers have reported cases of people carrying or infected with strains of the dangerous fungus Candida auris that were resistant to all major classes of antifungal drugs before any treatment, the Centers for Disease Control and Prevention said Thursday. The agency also reported evidence of some transmission of the strains within health facilities. Candida auris, or C. auris, which was first seen in 2009, has been highly resistant to the few available treatment options for several years, leaving people who treat and study fungal diseases concerned about the toll this superbug could take, particularly on severely ill patients. That there are now so-called pan-resistant cases in people who had never been treated with antifungal drugs is particularly unnerving, experts said.

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