Abbreviations: BtCoV-HKU4: Bat Coronavirus HKU4; BtCoVHKU5: Bat Coronavirus HKU5; DPP4: DiPeptidyl Peptidase 4; ECDC: European Centre for Disease Prevention and Control; HACE2: Human Angiotenssion Converting Enzyme 2; HCoV-229E: Human Coronavirus 229E; HCoV-HKU1: Human Coronavirus HKU1; HCoVNL63: Human coronavirus NL63; HCoV-OC43: Human Coronavirus OC43; HCP: HealthCare Personnel; HCW: Health C...