No corners were cut in vaccine process, says World Health Organisation
She also said that the logistics of distributing the vaccine is now the main challenge.
Doctor Margaret Harris from the World Health Organisation (WHO) has said the process to develop a Covid-19 vaccine was sped up but that "corners have not been cut".
Speaking to Morning Ireland on THursday, Harris also stressed the point that the vaccine will not immediately solve all Covid-related problems.
She said: "It is not like 'I have the vaccine, everything is good'. No, what matters is what is happening in your body.
"Do you have the antibodies that protect against the virus? We know we need the second dose in many of these regimes to ensure that protection."
Harris also said that the logistics of distributing the vaccine is the main challenge.
"Not only do you want to make sure they get into people's arms but you want to make sure they are followed up for the second dose and you want to follow everybody to understand whether or not there are any rare side effects and among who that might be occurring.
"All these things, all that tremendous planning work that has started, everyone has been thinking about this for some time, but now there will be a huge acceleration."
She also insisted that as much information about the vaccine should be released as possible, to ease the anxiety that some people may have about getting the vaccine.
You can listen to the interview in full here.
This comes as the UK announced that the Pfizer Covid vaccine will be rolled out from next week after it was officially authorised by the UK government.