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Hantaviruses are a family of viruses spread by rodent feces, saliva and urine, according to the U.S.

Unauthorized visitors left human feces in rivers, painted graffiti on once pristine cliffs, harassed wild animals and left the toilets looking like “crime scenes”, the supervising ranger said.

There’s also the grotesque poo facial, which went viral after one influencer smeared feces on her face.

In addition, it’s possible people are shedding inactivated virus in their feces, said Alexandra Boehm, professor of civil and environmental engineering at Stanford University and principal investigator and program director for WastewaterSCAN.

A makeshift laundry line hung from a vent, and graffiti adorned the walls, including slogans that read “Contentment is an everlasting treasure,” or “Release will come one day,” daubed with blood or feces.