More than two million Covid-19 vaccine doses have now been administered in Northern Ireland.
This includes first and second doses.
The Department of Health said that 80% of the adult population have received a first jab, while close to 60% are fully vaccinated.
Northern Ireland today confirmed a further 261 cases of the virus, while no further deaths have been recorded
It comes as the country's first walk-in vaccination centre opened today.
First dose vaccinations are available for anyone aged over 18, who lives in Northern Ireland and is registered with a GP.
The centre at the SSE Arena in Belfast began taking appointments at 8.30am this morning and is open until 6.30pm this evening.
Lead nurse at the vaccination centre Maggie McGowan said that 80% of adults in Northern Ireland have been vaccinated, but it is only at about 50% for 18 to 30-year-olds.
"Today we have decided to open the doors here at the SSE Arena Belfast and invite anyone over the age of 18 to come and walk in without an appointment, to come down to receive their first dose of Pfizer vaccine, as long as you live in Northern Ireland, or have a UK GP and have photographic ID and your healthcare number you can get vaccinated today with us, or the SSE without an appointment," she said.
Ms McGowan said a couple of hundred people had been vaccinated in the first few hours, and they had the capacity to do more than 1,000 jabs today.
She said that so far today, they were mainly seeing the 18 to 30 age cohort coming in to get their jabs.
"Lots of young people are coming in to get their vaccine, which is phenomenal," she said.
She said there are plenty of appointments available to book online too.
The walk-in centre is not administering second dose vaccines to people, and those awaiting a second jab should not go to the arena and should keep their appointments as planned.
Ms McGowan said it is "very difficult" for the health service to manage requests from people to change the date and time of their second appointments.
She said that while "huge steps" have been made to vaccinate the population in Northern Ireland, Covid-19 is "very much still out there" and that we are still in the middle of a pandemic.
"It's important that people here who still have to be vaccinated, come forward to receive their vaccination, in order that we can someday return to some sort of normality.
"I can't emphasise enough that we all have a part to play."
Welcoming the two million dose milestone, Northern Ireland's Health Minister thanked those involved in running the vaccine programme and the people who have had "the good sense" to come forward in very large numbers.
Robin Swann said he is urging anyone who has been "holding back" to come forward and "do it now".
"Vaccination protects you, it protects others and helps us get back to normality to enjoying so many things that were not possible for much of the past 18 months."
Mr Swann said the threat from the virus is still with us, "as evidenced by the spread of the Delta variant".
