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... Medical mycologist Shawn Lockhart stepped to the podium and began describing a fungal disease that attacks cats, causing oozing skin ulcers and worse, and spreads to humans. It isn't yet in the United States ... that officials know of. But the disease, caused by Sporothrix brasiliensis, has sickened and killed thousands of cats and infected more than 11,000 people and at least 200 dogs in South America since its emergence in Brazil in the 1990s.

"What we have right now is this ginormous ongoing outbreak of Sporothrix brasiliensis in Brazil," Lockhart, a senior adviser at the U.S. Centers for Disease Control and Prevention, said June 7. The fungus has spread beyond Brazil to cats, dogs and people in Paraguay, Chile, Argentina and most recently Uruguay.

"It's just a matter of time" until the fungus reaches the United States, Lockhart told me after the session. "We're waiting."

Here's why he's so concerned.

He worries about the fungus spreading in big cities such as Istanbul and Bangkok where "cats are just everywhere," and in rural areas in the United States where large populations of farm cats roam freely.

"All it takes is one traveler [from South America] bringing their cat with them, and it can emerge anywhere," Lockhart said during the presentation. "This is something we are very, very worried about." ...