Scientists are currently growing the particular Delta Covid variant within laboratories with the aim of deliberately infecting volunteers.
British scientists are developing the examples to use in challenge tests — which see individuals paid up to £ four, 500 for taking part.
Two tests by Imperial College London as well as the University of Oxford started in London in March with the goal of developing new vaccines and treatments.
Forty healthy, young volunteers have already been exposed to the original Wuhan strain, under cautious supervision.
However the next stage of studies will infect participants with Delta, the more transmissible stress which is now dominant over the UK.
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Challenge-trial partner hVivo and co-workers in the Netherlands have been growing the variant, according to Andrew Catchpole, the company’s chief scientific officer.
Mr Catchpole, a virologist, mentioned the variant — which is being grown from a pioneering human sample — has proven harder to develop than the original Wuhan strain.