SARS-CoV-2 Serological Surveillance of Both Vaccinated and Unvaccinated Zoo Animals with the Identification of a Sloth Bear and a Tapir with Previous Infection

对已接种疫苗和未接种疫苗的动物园动物进行SARS-CoV-2血清学监测，并鉴定出一只曾感染过该病毒的懒熊和一只貘。