That's according to the zoo on Monday.

They are the first known case is off natural transmission to great apes, though for now, the zoo says none seemed to be severely ill and are all expected to fully recover.

Lisa Peterson is director at the Zoo Safari Park.

They're experiencing some mild symptoms, and we continue to observe them, but they're drinking their eating and they're interacting with one another.

Three off The critically endangered western lowland gorillas began coughing last week, and fecal samples from one of them detected the virus.

Peterson said they suspect the team member who passed it on to the guerrillas was asymptomatic.

That's despite all of the precautions that we take.

We follow CDC guidelines.

We follow San Diego County health guidelines.

Um, the team wears PPE around all of our wildlife, and so even with all those precautions, we still have a nexpo jher that we think happened with that team member.

The zoo hasn't ruled out that other members off the gorilla troop have it to the virus has previously bean transferred to Lions, tigers and a small number of pet cats and dogs.

Among the first known US cases of animals testing positive was a tiger at a New York Zoo.

The Malayan Tiger Nadia recovered and was reported to be eating and behaving normally.