Bananas are facing a pandemic, too. Almost all of the bananas exported globally are just one variety called the Cavendish. And the Cavendish is vulnerable to a fungus called Panama disease, which is ravaging banana farms across the globe. If it's not stopped, the Cavendish may go extinct. We visited a farm in Colombia infected with Panama disease and a lab in the Netherlands studying the fungus to see if biosecurity and breeding can save the $25 billion banana industry.