How do zoo caretakers get animals to stay still for a vaccine? Michael Adkesson vaccinates a sloth at the Brookfield Zoo on September 7. CATHY BAZZONI—CZS-BROOKFIELD ZOO In January 2021, eight gorillas at the San Diego Zoo Safari Park, in California, became the first great apes to test positive for COVID-19. “There was immediate concern,” Nadine Lamberski told TIME for Kids. She’s the chief conservation and wildlife health officer at the San Diego Zoo Wildlife Alliance.