GOV.WALES uses cookies which are essential for the site to work. Non-essential cookies are also used to tailor and improve services. By continuing to use this site, you agree to our use of cookies.
You are here:
Verb
Y broses o roi brechlyn i bobl ac i bobl ddatblygu imiwnedd i afiechyd yn sgil hynny.
Pan fydd “immunisation” yn enw torfol.