Learning from other vaccination programmes and research we know there are some groups of people who are, for various reasons, less likely to take up their offer of a COVID-19 vaccine.
Gan ddysgu o raglenni brechu eraill a gwaith ymchwil, gwyddom fod rhai grwpiau o bobl, am wahanol resymau, yn llai tebygol o fanteisio ar eu cynnig o frechlyn COVID-19.