An Amur tiger. (TheOtherKev / Pixabay)

The 11-year-old tiger had received her first dose of a COVID-19 vaccine developed for animals. The zoo is now awaiting test results for other big cats that are exhibiting symptoms similar to the infected tiger’s.

A Linnaeus’s two-toed sloth at Brookfield Zoo receives a COVID-19 vaccine. (Cathy Bazzoni / Chicago Zoological Society-Brookfield Zoo)

Animals at Brookfield Zoo have begun receiving COVID-19 vaccinations, with Lincoln Park Zoo soon to follow, as federal and state officials approved the use of the inoculations.