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Boris Johnson set out ambitious new vaccine rollout goals when he delayed the lockdown's end by to July 19.
But the UK's latest daily vaccination figures put that goal in doubt, as reports suggest one of the key vaccines used in the rollout will soon be hit by a shortage.
The Prime Minister changed the nation's so-called 'Freedom Day' last week amid concern over new Covid strains, including the Delta variant, first identified in India, which is seeding fresh outbreaks in the UK.
The leader told Britain restrictions will not relax on June 21, as the government needs to allow time for more of the adult population to be vaccinated.
He set out a fresh target of offering a first dose to all over-18s and second doses to two-thirds of all UK adults by July 19.
Boris Johnson has set big targets for the delayed lockdown restrictions easing date
(Image: Getty Images)
However, unless the UK keeps up the bumper daily jab rates recorded Saturday – when a whopping 650,000 shots were administered – it will only achieve two-thirds of the PM's target, according to the Mirror's analysis.
The latest seven-day average shows daily jab rates are not fast enough for the target, unless efforts are ramped up over the next month – even as reports claim a Pfizer shortage is imminent.
As of Tuesday, June 16, 41.8million people had received at least one dose of a vaccine – equating to more than three-quarters of the adult population.
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That means around 57% of the UK's estimated 52m adults are fully protected against the virus.
As of mid-2019, the population of the UK aged 18 and above was 52,673,433, according to the ONS.
And as of Tuesday, June 16, a total of 30,209,707 people had received two doses of a vaccine.
Reports claim there will be a Pfizer jab hortage in the weeks to come before stocks are replenished in July
(Image: AFP via Getty Images)
Whitehall insiders told the i Paper on Tuesday they were confident the daily rate of just under 400,000 jabs would ensure the rollout hits the target.
Sources said it should be achievable without any need to boost the daily numbers, despite second doses only being given to people who had their first jab eight to 12 weeks ago.
A No 10 spokesman said: “What we’ll see is what we have seen throughout that supply fluctuates week from week and day from day.
"We have a robust supply of vaccinations that allows us to proceed at pace.”
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But according to the Mirror's analysis, the UK's vaccinators will need to get around 611,000 jabs in arms total per day from Wednesday in order to make good on Mr Johnson's promise.
The latest available data, captured June 14, showed the UK was jabbing 132,627 people a day with their first dose and 235,928 with their second daily, according to seven-day averages.
If that seven-day average rate continues, the UK will be putting 368,555 shots in arms per day until July 19.
Young people are being invited to book their jabs this week as the rollout extends to 21 and 22-year-olds
(Image: AFP via Getty Images)
But unless the vaccination effort is stepped up significantly over the next month, that would see the rollout reach only around 60% of the PM's stated goal for first and second doses by July 19.
But the Daily Telegraph is reporting that a shortage of the Pfizer vaccine will slow down the rollout of jabs in weeks to come.
According to a leaked letter seen by the newspaper, vaccination centre staff and volunteers in Derbyshire were told by the NHS to expect shift cancellations due to limited supplies.
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Pfizer stocks are reportedly expected to be replenished in July.
Ian Ward, the leader of Birmingham City Council, told the publication the city would be "in exactly the same position" by July 19 unless the shortage could be solved.
He said: "Unless the Government can deliver the Pfizer or Moderna vaccines in the right numbers, it's hard to see how we could safely unlock on July 19 – and that goes for the whole country."
The rollout has extended to younger adults with officials vowing 18-year-olds turn is only days away now
(Image: Daily Mirror/Andy Stenning)
Eight in 10 England adults already have coronavirus antibodies, Office for National Statics (ONS) figures in the second week of June showed.
That proportion will be growing, as younger adults are invited to book their first doses this week.
The Government has vowed that all adults in England should be able to book their first jab by the end of this week, with only the 18-20s left to take their turn.
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Appointments opened to 21 and 22-year-olds in England for the first time on Wednesday.
The NHS said it would be contacting a total 972,000 21 to 22-year-olds to invite them to book their appointments.
NHS chief Sir Simon Stevens rallied for the UK's vaccine effort on Tuesday.
He vowed the health service will "finish the job" of the Covid-19 vaccination programme to the "greatest extent possible" over the next four weeks after the government extended the final phase of lockdown restrictions.
The UK is not yet extending the vaccine rollout to those younger than 18.
Cabinet minister Liz Truss today said the Joint Committee on Vaccination and Immunisation (JCVI) was not recommending offering jabs to under-18s at this stage.
The International Trade Secretary told BBC Breakfast: "Of course the Government will look very closely at the JCVI's recommendations.
"It is my understanding that they are not recommending the vaccination of under-18s and we will be saying more in due course about that."