A resistant superbug fungus that can kill people within 90 days is creeping into countries across the globe, with more than 587 cases confirmed in the US, according to the Centers for Disease Control.

The CDC recently added the Candida Auris fungus to a list of now-three “urgent” antibiotic-resistant threats after an investigation into outbreaks at New York City hospitals.

In May last year, an elderly man died in Mount Sinai Hospital from the fungus after abdominal surgery. Outbreaks have also been reported at a Venezuelan neonatal unit and British medical center.

In the US, most of the confirmed cases have been out of New York as of February 2018, according to the CDC.

The yeast targets people with weakened immune systems, such as babies and elderly people, and causes hard-to-cure infections.

It’s part of a surge of infections contracted in healthcare facilities that have become immune to antibiotics.

Given the speed at which the inspection spreads, coupled with its resistance to medication, “the prospect of an endemic or epidemic multidrug-resistant yeast in US healthcare facilities is troubling,” the CDC said in October.