Janssen last month revealed trials in adults showed its single-dose Covid vaccine is 66 per cent effective in preventing coronavirus.
The UK has ordered 30 million doses of the Janssen jabs and deliveries are expected to arrive in the second half of this year if the vaccine is approved by regulators.
It will initially extend trials to teenagers.
If the jab is effective in them, it will gradually test it on younger and younger children.
Hanneke Schuitemaker, who is head of viral vaccine discovery at Janssen, said discussions had begun to approve studies into the vaccine’s effects on 16 and 17-year-olds and after that ‘we will go further down to 12-year-olds but even to newborns at a certain point if all goes well’.
The trials are likely to take place in the US and Canada.
AstraZeneca said a trial will begin this month on 300 volunteers aged six to 17 in Oxford, London, Southampton and Bristol.
Oxford vaccine chief Professor Andrew Pollard said: ‘It is important to establish the safety and immune response to the vaccine in children and young people as some children may benefit.’
A licensed jab for children could be available by the end of the year.
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