A tiger at the Bronx Zoo in New York City has tested positive for Covid-19, and six other big cats are exhibiting symptoms consistent with the illness, the US Department of Agriculture said, according to National Geographic.

“It’s the first time, to our knowledge, that a [wild] animal has gotten sick from Covid-19 from a person,” says Paul Calle, chief veterinarian for the Bronx Zoo.

The Malayan tiger, named Nadia, likely contracted the coronavirus from an infected — but unknown — asymptomatic zookeeper. “It’s the only thing that makes sense,” Calle says.

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