YOSEMITE NATIONAL PARK, Calif. — California health officials are investigating another possible case of plague in a tourist from Georgia who fell ill after visiting Yosemite National Park, the second case in less than a month.

The California Department of Public Health said Tuesday “the presumptive positive case” of plague occurred on a patient who visited Yosemite, the Sierra National Forest and surrounding areas in early August.

The federal Centers for Disease Control is testing the person, whose gender and age were not released, officials said.

U.S. Public Health Service Dr. Danielle Buttke, who is in Yosemite investigating the outbreak, says no new areas have been closed in Yosemite.

A child fell ill with the plague after camping with his family at Yosemite’s Crane Flat Campground in mid-July. The park reopened Crane Flat last week after treating it for four days with an insecticide.

Plague is carried by squirrels, chipmunks and other small rodents and is spread by their fleas. But transmission between people is rare.