And a German virologist revealed the country was sitting on a whopping 1.2 million Oxford jabs - after EU leaders repeatedly made baseless allegations about its efficacy.
Just four per cent of the German population has been immunised, compared to England's 27.4 per cent, according to the BBC.
Plans for vaccine certificates to reopen tourism are also moving slowly due to bitter infighting among European countries over their use.
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Some eurocrats have hinted restrictions on non-essential travel that affect Brits won't be dropped until 70% of European adults are jabbed.
Asked if we'll be able to holiday on the continent this summer, one said: "I have no crystal ball. It's too soon to say.
"There is a will to make sure by summer that we have 70% of people vaccinated."
Spanish PM Pedro Sanchez has previously said his country will be "better prepared" to welcome tourists back once 70% of people are jabbed.
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But some euro insiders insist the eventual use of vaccine passports and mass testing are a more likely route to getting borders open again.
One said: "There are many ways to solve this and a simple link to the 70% might not be the best."
The EU has set a target of vaccinating 70% of its population by September 21.
EU leaders are holding a video call tonight to try and make progress.
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But in a joint statement they are only set to "call for work to continue on a common approach" and agree to "come back to this issue".
They will warn: "For the time being, non-essential travel needs to be restricted."
Germany and France are both resistant to the idea, which is being pushed by Mediterranean countries like Greece, Italy, Spain, and Portugal.
For the time being, non-essential travel needs to be restricted
EU leaders
Mrs Merkel said "it must actually be clearly resolved that vaccinated people are no longer infectious" before jabs passports can be introduced.
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She added: "As long as the number of those who have been vaccinated is still so much smaller than the number who are waiting for vaccination, the state should not treat the two groups differently.
"Until the so-called herd immunity is achieved in a few months through the vaccinations, it is my goal to proceed in such a way that we don't keep opening and then closing again.
"For this we need a lot of patience and strength."
EU insiders warned talks over using jabs passports to open up tourism again are "complicated" given the divisions within the bloc.
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A senior EU diplomat said there is agreement such documents should be used for cross-border healthcare.
But they warned applying them to international travel presents "many, many more difficulties" for some countries.
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They added: "We still don't have advice from the health authorities on what the vaccine does and does not do.
"Can you still contaminate others if you have been vaccinated? I don't know."
The diplomat said European countries want a joint approach and expressed doubts any would go it alone by letting Brits in early.
An EU official said the debate on reopening international travel is splintered with "everyone thinking in their own corner".
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They said: "Politically it's perhaps too much to digest right now with more immediate issues to solve first."
A second EU official was more blunt, saying the bloc wants to avoid "a new death season".
Some EU leaders are much more impatient to reopen their borders again to travellers from both other European countries and Britain.
Austria's Sebastian Kurz called for a "green passport" that could be used to allow vaccinated people travel freely within the EU.
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He said: "We want to get back to normal as quickly as possible, have our old lives back, and maximum freedom."
EU diplomats have said such a scheme could be extended to Britain if our infection rates drop significantly.
One said: "If the British vaccination plans work out then we could have that discussion.
"If Britain would be successful, there would be a willingness to do so."