Prime Minister Boris Johnson will give a Covid update from Downing Street on Thursday at 5 p.m.
It is because of the fears that a disruption in the supply chain could delay the launch of the vaccine.
Five million doses that were supposed to come to the UK from India have been delayed by four weeks.
This means that people over 40 will not get a sting in April.
The European Union has also announced that it will block the supply of vaccines from factories on the continent to the UK.
The number of people vaccinated is one of the factors that will determine when the location can be unlocked.
People in their forties will likely have to wait until May to get their Covid-19 vaccine after problems with a delivery of the AstraZeneca batch from India impacted supplies.
The head of the Serum Institute of India (SII), which makes the vaccine, suggested that the country’s government block exports to the UK.
Professor Martin Marshall, chairman of the Royal College of GPs, said the news of supply shortages was “disappointing” and “a minor setback” and that the focus in England in April would be on giving people who had previously been vaccinated a second dose to be administered in the year.
“The effects of this supply shortage will have an impact on the group we wanted to start with in April. These are the people under the age of 50 with no prior conditions who will have to wait until May now. He told BBC Radio 4’s Today program.
Cabinet Secretary Robert Jenrick also admitted vaccine rollout would be slower than expected due to the shortage, while Professor Adam Finn, member of the Joint Committee on Vaccination and Immunization (JCVI), said vaccinating those under the age of 50 could kick a bit later than we had hoped optimistically ”.
But Northern Ireland suggested that it may still be able to start vaccinating people in their forties by mid-April.
A delay in delivering five million doses of the AstraZeneca coronavirus vaccine from India is partly due to an impending reduction in UK supply.
The delivery was expected by the SII but was delayed by four weeks.
Adar Poonawalla, executive director of SII, told The Telegraph: “It is entirely dependent on India and has nothing to do with the SII. It has to do with the Indian government allowing the UK more cans. “
Housing Secretary Jenrick told BBC Breakfast that the ultimate goal of vaccinating all adults with one dose by the end of July is still on track.
However, the vaccination and rollout numbers suggest that the NHS was able to easily achieve this goal.
Mr Jenrick said, “We have some supply issues which means the vaccine adoption will be a little slower than we hoped, but no slower than the goal we have set for ourselves.
“We will move forward as soon as possible, but it won’t be as fast as we hoped for a couple of weeks, but then we have every reason to believe that supply will increase in the months of May. June and July.”
He said the government had learned of problems with the coronavirus vaccine supply “in the past few days” and suggested the problem was not due to cuts by a single nation.
“We have heard from some of our manufacturers that there will be supply problems in the last few days,” he told BBC Radio 4’s Today program.
“A number of global manufacturers are having problems.”
When pressured, when it came to a vaccine from India, he said: “It is not that there is a factory that is responsible for this or any other country.”
Professor Finn of the University of Bristol and a member of the JCVI said today that “Vaccines are definitely difficult to supply”.
He added: “In the past in the UK we have always tried to have more than one supplier of more than one vaccine whenever possible as it does from time to time.
“And I think even more than I do now, because these vaccines are new technologies and they are quite difficult to make on a large scale.”
Prof. Finn said the current goal is to complete priority groups 1 to 9 (age 50+ plus state of health), but also “to give these second doses, as JCVI was very clear from the start that these second doses were in the Must be administered in the correct order to provide the long-term protection that people need ”.
He said that the 12 weeks between the first and second dose “must not slide significantly and I think this may mean that the next phase, phase two (under 50), starts a little later than we had optimistically hoped” .
A letter to leading health authorities in England published on Wednesday warned of a “significant reduction in the weekly supply” of the vaccine from March 29, “which means the volume for the first doses will be severely restricted”.
In the letter from Emily Lawson, Chief Commercial Officer of the NHS, and Dr. Nikita Kanani, medical director of primary care, said that “people 49 years of age or younger should not be offered vaccination” unless they belong to a higher priority group, such as if they are clinically at risk.
The UK Vaccine Task Force predicts that the shortfall will be four weeks “due to the reduction in the national supply of incoming vaccines”.
A spokesman for the SII told the BBC: “Five million doses were shipped to the UK a few weeks ago and we will try to deliver more later based on the current situation and requirements for the government vaccination program in India.”
AstraZeneca has partnered with the institute, the world’s largest vaccine maker, to deliver supplies to the Government of India but also to other countries including low and middle income countries.
The European Medicines Agency (EMA) will issue its judgment on the safety of the AstraZeneca vaccine after more than a dozen European countries halted its introduction due to blood clot fears.
In the meantime, the government has announced that the shield will officially end on April 1st. Those on the screened patient list will receive letters starting Thursday.
Dr. Jenny Harries, the UK’s assistant chief medical officer, said, “As the spread of the virus continues to decline in the community, now is the time for people to think about relaxing these stricter guidelines.
“Once you have shielded, we strongly recommend that you take extra precautions after April 1st to keep yourself as safe as possible, such as walking around the corner. B. Continue to observe social distancing and work from home.
“We will continue to monitor all evidence and adjust this advice if infection rates change.”