A four-year-old female Malayan tiger at the Bronx Zoo has tested positive for the coronavirus.
The tiger, named Nadia, is believed to be the first known case of an animal infected by a human with Covid-19.
The Bronx Zoo, in New York City, says the test result was confirmed by the National Veterinary Services Laboratory in Iowa.
Nadia, along with six other big cats, is thought to have been infected by an asymptomatic zoo keeper.
The cats started showing symptoms, including a dry cough, late last month after exposure to the employee, who has not been identified.
“This is the first time that any of us know of anywhere in the world that a person infected the animal and the animal got sick,” Paul Calle, the chief veterinarian at the zoo, told Reuters news agency on Sunday.
He said he intends to share the findings with other zoos and institutions researching the transmission of Covid-19.
“We tested the cat [Nadia] out of an abundance of caution and will ensure any knowledge we gain about Covid-19 will contribute to the world’s continuing understanding of this novel coronavirus,” the zoo said in a statement.
Nadia, her sister Azul, as well as two Amur tigers and three African lions who showed symptoms, are all expected to make a full recovery, the zoo said.
The big cats did have some decrease in appetite but “are otherwise doing well under veterinary care and are bright, alert, and interactive with their keepers”, it said.
The zoo said it is not known how the virus will develop in animals like tigers and lions since various species can react differently to new infections, but all the animals will be closely monitored.