It's emerged two people had allergic reactions after being given the Pfizer Bio N Tech vaccine in the UK yesterday.
The British health regulator's now issued a warning that people with a history of 'significant' allergies shouldn't have the jab for now.
The MHRA's chief executive Dr June Raine says investigations are under way.
Meanwhile, the Tanaiste says he is hopeful we will be able to take foreign holidays by Summer 2021.
Leo Varadkar says he also expects matches and outdoor concerts to take place next year too.
It's expected the vaccine programme will be rolled out in January next year, paving the way for a further reopening of the economy and society.