Like all medicines, no vaccine is 100 per cent effective and some people may get COVID-19 despite having the vaccination, but their infection will be less severe.
Once you have had your vaccine, you must still act to prevent the spread of coronavirus in the community and continue to follow the COVID-19 guidance (social distancing, face coverings, lockdowns) to protect those around you.
While you cannot catch COVID-19 from the vaccine, it is possible to have caught COVID-19 and not realise you have the symptoms until after being vaccinated. The most important symptoms of COVID-19 are recent onset of any of the following:
Some people also have a sore throat, headache, nasal congestion, diarrhoea, nausea and vomiting.
If you have any of the symptoms above, stay at home and arrange to have a test by calling 119 or visiting Gov.wales information about Coronavirus (opens in new tab). If you need more information on symptoms visit the 111 website (opens in new tab)