The Grand Canyon National Park announced Sunday that a historic lodge on the Grand Canyon’s North Rim had been destroyed by a wildfire

A park employee at the Grand Canyon was exposed to hantavirus, and a separate case of exposure to rabies in the park has also been confirmed.

Nearly 5 million people visited the Grand Canyon last year, from day trippers and campers to people sleeping overnight in historic lodges and cabins.

Hantavirus is primarily spread by deer mice, which are prevalent in the Grand Canyon area. The virus can cause a host of serious, even fatal, illnesses such as hantavirus pulmonary syndrome (HPS) and hemorrhagic fever with renal syndrome (HFRS), according to the Centers for Disease Control and Prevention ( CDC ).