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BROOKFIELD, Ill. – An 11-year-old tiger at a suburban Chicago zoo tested positive for COVID-19, officials said Friday.

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Malena, an Amur tiger, began showing signs of “mild respiratory illness” late last week at the Brookfield Zoo, WFLD reported.

“Malena is an older tiger and therefore at an elevated risk,” Mike Adkesson, vice president of clinical medicine for the Chicago Zoological Society, said in a news release. “However, she’s in good health and her symptoms have been relatively minor. We are optimistic she will make a full recovery.”

Other big cats at the zoo are now showing symptoms similar to Malena’s, including coughing and sneezing, WTTW reported. Zoo officials are awaiting results on tests submitted to the U.S. Department of Agriculture’s National Veterinary Services Laboratories. Those results should be available next week, zoo officials told the television station.

Malena and other high-risk animals at the zoo began receiving their first doses of the COVID-19 vaccine designed for animals, zoo officials said in a news release. Malena received her first dose on Sept. 16 and was supposed to get her second shot next week, WMAQ reported.

I“Having had one dose of the animal vaccine, it’s reasonable to expect that Malena’s immune system was partially primed to combat the virus, and therefore the severity of her illness has been decreased,” Adkesson said in a news release.

As a precaution, the zoo closed its Clouded Leopard Rain Forest and Desert’s Edge indoor exhibits, according to WLS.

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