With tourist season about to begin at the popular Oregon Caves National Monument, officials are worried about a fungus that's killing off bat populations in the eastern U.S. Visitors are asked not to wear clothing or shoes they've worn to any bat habitats east of the Rockies or in Europe. “This is a major event, we think, is very serious. Several State Parks, for example have already closed east in the United States to try to reduce the spread.” Staff member John Roth says otherwise, everybody’s welcome to the annual Open House at the Oregon Caves National Monument.