(MSN) Last May, an elderly man was admitted to the Brooklyn branch of Mount Sinai Hospital for abdominal surgery. A blood test revealed that he was infected with a newly discovered germ as deadly as it was mysterious.

Doctors swiftly isolated him in the intensive care unit. The germ, a fungus called Candida auris, preys on people with weakened immune systems, and it is quietly spreading across the globe.

Over the last five years, it has hit a neonatal unit in Venezuela, swept through a hospital in Spain, forced a prestigious British medical center to shut down its intensive care unit, and taken root in India, Pakistan and South

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