Two squirrels in Yosemite National Park in California have died from the plague, and the park will close the Tuolumne Meadows Campground as a result, according to a Washington Post report.
A child who visited Yosemite in July contracted the plague there and is still recovering from the illness.
During the campground closure, which will last through Aug. 21, the park will treat fleas in rodent burrows. The park called it an "extremely precautionary public health measure."
California is not the only state dealing with plague cases this year — Colorado has seen two plague deaths this year. According to the CDC, a median of eight cases of human plague are reported each year in the U.S.