Yosemite National Park will be closing a campground after many plague-infected squirrels have died, and a child falling ill.

The campground where the child was staying with family and fell ill was the Tuolumne Meadows Campground. The site, 40 miles west of Crane Flat, is also where all of the plague-infected squirrels were found, according to the Los Angeles Times.

Park officials will be applying flea insecticide to rodent burrows in an, “extremely precautionary public health measure,” starting at noon on Monday through Friday, August 21^.

Officials said that the infectious disease can be carried by not only squirrels, but also chipmunks and other rodents via fleas. Even when an infected rodent dies, the fleas are what carry the disease to other animals as well as humans.

The child that contracted the disease in mid-July was on a family vacation to Stanislaus National Forest as well as the Yosemite campground. The child that was reported falling ill from the area in the park has fully recovered in their home in Los Angeles County.

As for the Crane Flat Campground, after four nights of flea treatments, reopened on Friday, according to the California Department of Public Health.

“Although the presence of plague has been confirmed at Crane Flat and Tuolumne Meadows campgrounds, the risk to human health remains low,” the health department said.

The health department added that an environmental evaluation in the Stanislaus National Forest, Yosemite National Park and close by areas ignited the closures.

There has been prior evidence of this plague detected back in 2014 in animals in El Dorado, Mariposa, Modoc, Plumas, San Diego, Santa Barbara and Sierra counties. Animals infected with the disease are usually found in the mountains, foothills and on the coast of California.

Since 1970, there have been 42 cases of the plague found in humans, with nine of those cases leading to death. Symptoms include high fever, chills, nausea, weakness and swollen lymph nodes in the neck, armpit or groin.