The zoo's veterinary team determined the animals that were most at risk of contracting COVID-19 or its variants.
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Those animals include orangutans, siamangs, lions and cheetahs.
The vaccinations of those priority animals and primates started last month.
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Zoo officials said they are now about halfway through the list of species designated to receive a dose.
Chaffee Zoo staff members also continue safe practices, including wearing personal protective equipment around sensitive species.