International registries continue to grow
The international registries grew further, even in the second year since the onset of the Covid-19 pandemic. The number of people registered as donors worldwide has nearly doubled in the past ten years. Quality has increased as well: the average age of registered persons is younger, and the tissue typing data available for them is better (96% ABDR typed vs. 88% in 2011), meaning more of their tissue markers and other markers (CMV, KIR, HLA-E) have been determined.
Country-specific differences also became apparent in the light of the Covid-19 pandemic, though. Country registries whose registration processes had not yet been digitalised were unable to recruit during certain periods because lockdown rules prevented sample collection at public events. Covid-19 also caused some interruptions in the international transport processes in 2021, processes used to carry vitally needed blood stem cells from donors to patients in time. This was due to testing requirements, vaccine requirements for cross-border travel, the complete or partial air travel restrictions, quarantine regulations or rules requiring couriers responsible for transporting transplant material to obtain special authorisations.