Mae treialon clinigol yn y Deyrnas Unedig wedi bod yn hollbwysig yn y gwaith o ddatblygu brechlynnau effeithiol yn erbyn COVID-19 ac rwy'n hynod ddiolchgar i'r nifer fawr o bobl o Gymru a gymerodd ran mewn treialon. Fe wnaeth bron i 1,400 o bobl yng Nghymru gamu i’r adwy pan oedd eu hangen arnom. Dyna weithred ryfeddol o hael a charedig ar ran pobl eraill.
UK clinical trials have played a critical role in the development of effective vaccines against COVID-19 and I am extremely grateful to the many people from Wales who took part in a vaccine trial. Just under 1,400 people in Wales selflessly stepped up when we needed them. It is a truly remarkable act of generosity and kindness to their fellow human beings.