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Donald Trump’s White House offered a German science lab cash to develop a coronavirus vaccine exclusively for the United States, it has been claimed.

Berlin is trying to stop Washington from poaching CureVac, a firm working towards a vaccine - as German politicians insist no country should have a monopoly on such a drug.

German government sources said the U.S. administration was looking into how it could gain access to a potential vaccine being developed by the firm.

Earlier, the Welt am Sonntag German newspaper reported that U.S. President Donald Trump had offered funds to lure CureVac to the United States, and the German government was making counter-offers to tempt it to stay.

"The German government is very interested in ensuring that vaccines and active substances against the new coronavirus are also developed in Germany and Europe," a Health Ministry spokeswoman said, confirming a quote in the newspaper.

(Image: ARMANDO BABANI/EPA-EFE/Shutterstock)

"In this regard, the government is in intensive exchange with the company CureVac," she added.

Welt am Sonntag also quoted an unidentified German government source as saying Trump was trying to secure the scientists' work exclusively, and would do anything to get a vaccine for the United States, "but only for the United States."

A German Economy Ministry spokeswoman also said Berlin "has a great interest" in producing vaccines in Germany and Europe.

She declined to comment on any takeover possibilities but referred to Germany's foreign trade law, under which Berlin can examine takeover bids from non-EU, so-called third countries "if national or European security interests are at stake".

There was no comment immediately available from the U.S. embassy in Berlin when contacted by Reuters on Sunday over the report, and nobody was available to comment at CureVac. Welt am Sonntag said CureVac declined to comment.

(Image: REUTERS)

Florian von der Muelbe, CureVac's chief production officer and co-founder, told Reuters last week the company had started with a multitude of coronavirus vaccine candidates and was now selecting the two best to go into clinical trials.

The privately-held company based in Tuebingen, Germany hopes to have an experimental vaccine ready by June or July to then seek the go-ahead from regulators for testing on humans.

On its website, CureVac said CEO Daniel Menichella early this month met Trump, Vice President Mike Pence, members of the White House Coronavirus Task Force and senior representatives of pharmaceutical and biotech companies to discuss a vaccine.

Karl Lauterbach, a professor of health economics and epidemiology who is also a senior lawmaker with Germany's Social Democrats, tweeted in reaction to the Welt am Sonntag report: "The exclusive sale of a possible vaccine to the USA must be prevented by all means. Capitalism has limits."

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CureVac in 2015 and 2018 secured financial backing for development projects from its investor the Bill & Melinda Gates Foundation, working on shots to prevent malaria and influenza.

In the field of so-called mRNA therapeutics, CureVac competes with U.S. biotech firm Moderna and German rival BioNTech, which Pfizer has identified as a potential collaboration partner.

Drugs based on mRNA provide a type of genetic blueprint that can be injected into the body to instruct cells to produce the desired therapeutic proteins. That contrasts with the conventional approach of making these proteins in labs and bio-reactors.

In the case of vaccines, the mRNA prompts body cells to produce so-called antigens, the tell-tale molecules on the surface of viruses, that spur the immune system into action.

Companies working on other coronavirus-vaccine approaches include Johnson & Johnson and INOVIO Pharmaceuticals, Inc..