Funding statement

KRS received fellowship funding by the European Public Health Microbiology Training Programme (EUPHEM), European Centre for Disease Prevention and Control (ECDC). An ECDC representative formally approved the manuscript before submission. MPGK received funding from the H2020 COVID-19 project RECOVER (grant agreement nr 101003589). The funders had no role in the collection, analysis, and interpretation of data, nor the writing of the review.