TOO many people rescheduling Covid-19 vaccination appointments could "jeopardise the overall roll-out" of Northern Ireland's successful programme, the Department of Health has warned.
Rescheduled second vaccines have increased significantly, with more than 1,000 requests received in recent days.
Patricia Donnelly, Head of the Northern Ireland Vaccine Programme, said "any large scale changes could potentially jeopardise the overall roll-out of the programme".
"The success of the vaccine programme in Northern Ireland has been built on an amazing public response which has seen over one million people receive their first dose.
"Their cooperation has played a major part in bringing us to where we are today.
"It is imperative however that we recognise how important it is, that in order to maintain that progress the full and effective roll out is maintained."
She believes the increase in rescheduling requests is linked to the recent relaxation of regulations.
"I fully understand that we are all anxious to enjoy a more normal life including an opportunity to enjoy some of the things which have been denied us during the last 18 months," she said.
"However this programme is a massive and highly complex logistical undertaking requiring intense planning.
"The ongoing cooperation of everyone to come forward for their second dose on their appointed date is crucial.
"Getting your second dose is not only vital in providing fuller and longer lasting protection against the virus, but also to enable the thousands of people working so hard managing the roll out to do so as effectively as possible."
She said second appointments are automatically generated when the first one is booked to allow forward planning around the supplies of various vaccines and logistical arrangements for injections.
"It is the responsibility of each of us to ensure we are available for our second appointment, so we ask that where possible you avoid making commitments that clash with the date of your second dose - that includes booking flights and hotels - please look for alternative dates."
Ms Donnelly said where changing the date for the second dose is "unavoidable" people should "be patient".
"The same people who are running the vaccination centres and organising this very demanding vaccination programme are already busy so it will take time."
Booking for the vaccination centres should be done online at: covid-19.hscni.net/get-vaccinated and on 0300 200 7813.
Details of participating pharmacies can be found at: covid-19.hscni.net/community-pharmacy-covid-19-vaccination-service.
