USHUAIA, Argentina (AP) — Travelers hoping to catch a glimpse of Magellanic penguins and humpback whales have journeyed in greater numbers every year to Ushuaia, the main Antarctic cruise hub at the southernmost point of Argentina.

The wind-lashed city that bills itself as the “end of the world” now fears for its future. In the last week, the remote outpost has found itself at the center of speculation about the source of a deadly hantavirus outbreak on an Atlantic cruise after Argentina’s Health Ministry said it was examining whether the outbreak’s first victims, a Dutch couple who died in April, contracted the rat-borne virus there.