Mae brechlynnau'n chwarae rhan bwysig mewn iechyd cyhoeddus. Mae'r brechlyn COVID-19 wedi trawsnewid ein hymateb i'r pandemig – gan helpu i leihau salwch difrifol a marwolaethau.
Vaccines play an important role in public health. The COVID-19 vaccine has transformed our response to the pandemic, helping reduce serious illnesses and deaths.